Comparative metrics summary This document was provided at ...
Comparative metrics summary This document was provided at the May 17, 2013 Joint Groundfish/Habitat Committee Meeting. The analysis has not been updated yet for the DEIS, but the information provided may be useful to the Committee’s discussion on September 5, 2013. Variations on this metrics, and additional metrics, may be considered in evaluating each area’s attributes and potential benefits in the DEIS.
Comparative metrics summary 1.0
Introduction
The Closed Area Technical Team and Habitat Plan Development Team have developed a series of comparative metrics to help the Committees and Council distinguish between the various area management proposals (see figures later in this document for a summary of management areas). This document summarizes data in four categories – habitat vulnerability and characterization, groundfish hotspots, economics, specifically gear use by area, and species diversity. Not all metrics have been calculated/summarized for all types of areas. These analyses should be viewed as a work in progress and they will be updated with additional information in the coming weeks as additional analyses are completed, and as areas are modified. Additional work is underway to describe groundfish spawning condition, groundfish egg and larval distributions, groundfish distributions (other than hotspots), overlap with protected resources, and potential fishing opportunities within existing closures. 2.0
Habitat metrics a. Areas evaluated
This analysis compares habitat metrics for current groundfish areas, current habitat areas, new juvenile groundfish areas, new adverse effects habitat areas, and new dedicated habitat research areas. b. Methods GIS software was used to determine which output grid cells in the SASI model (100 km2 resolution) overlap with various management areas (see maps). If any portion of a grid cell overlapped any part of a management area, the grid cells were included in the analysis for that area. Total vulnerability to trawl gear of overlapping grids (Zinf) and the total area of overlapping grids in km2 were summed, and area-weighted Zinf was estimated as follows: (total Zinf/total area)*100 = Average overlapping Zinf per 100 km2 These values were then classified as low, below average, above average, high, or very high, according to where they fall on the distribution of Zinf values for the entire model domain. Mean Std deviation Category 2 std dev below
Page 1 of 14
46.80 3.91 Value 38.98
Range < 42.88
Vulnerability Low
Updated May 14, 2013
Comparative metrics summary 1 std dev below mean 1 std dev above 2 std dev above
42.89 46.8 50.71 54.62
42.89-46.79 46.08-50.70 50.71-54.61 > 54.62
Below average Above average High Very high
Next, GIS software was used to determine which unstructured (Voronoi) grid cells in the SASI model overlap with various management areas. If any portion of a grid cell overlapped any part of a management area, the grid cells were included in the analysis for that area. Attributes of these cells were summarized including the number of unstructured grid cells overlapping the area, mean depth, mean data support, and number of cells coded as each of five dominant sediment types. Data Support description Low
Code 1
Moderate
2
High Moderate
3
Very High Moderate
4
High Very High Ultra High
5 6 7
Description Very large grids, only mud, sand, and granule-pebble detectable Large grids, only mud, sand, and granule-pebble detectable Medium grids, only mud, sand, and granule-pebble detectable Small grids, only mud, sand, and granule-pebble detectable Medium grids, all substrate types detectable Small grids, all substrate types detectable Very small grids, all substrate types detectable
c. Caveats and future work Additional work will be done to characterize the uncertainty associated with model results in a given area, and to describe the distribution of substrate within each area. 3.0
Groundfish hotspot metrics a. Areas evaluated
This analysis compares groundfish metrics for current groundfish areas, current habitat areas, new juvenile groundfish areas, new adverse effects habitat areas, new dedicated habitat research areas, and new and modified spawning protection areas. b. Methods The hotspot analysis identifies locations with unusually high catches of juvenile (age 0 and 1) or large spawner-sized groundfish that are within high catch neighborhoods. A separate hotspot analysis was completed for each species and fishery-independent survey (for example, juvenile cod in the NMFS fall trawl survey, or American plaice in the MADMF spring trawl survey). Survey data from 2002-2012 was used in the analysis. Page 2 of 14
Updated May 14, 2013
Comparative metrics summary
Each hotspot was weighted according to factors such as stock status (juveniles and adults), habitat/substrate association (juveniles), and seasonality of spawning (spawners). The weighted hotspots were then aggregated across species and surveys, and gridded at the resolution of the SASI grid (10x10 km cells). The tables in this document list both the total number of hotspots across all species and the weighted value of those hotspots. The number of hotspots represents the number of tows within each management area (summing across species) that are high catch tows in high catch neighborhoods. High weighted values generally indicate that many of these hotspots are associated with high vulnerability stocks, low weighted values generally indicate that many of the hotspots are associated with lower vulnerability stocks. If there is a positive number of hotspots but a weighted value of zero, this indicates that all of the hotspots were zeroed out during the weighting process. This would occur for three reasons: the species is not a large mesh groundfish, the hotspots represent juveniles that are associated with soft sediments, or the hotspots represent large spawners but outside of a species’ known spawning season. To produce the summary tables, gridded hotspots were spatially joined to the management areas in ArcMap. A grid’s hotspots were included with that area if the center point of the 10x10 km grid fell within the area. Large mesh groundfish species are listed in the weighting tables below. Hotspots were also generated for alewife, herring, monkfish, red hake, and silver hake. The summary tables list the species with hotspots in each area, and the number of hotspots includes these additional species, but these species are not included in the weighted values. Juvenile hotspot weights. Stock (Red cells indicate selected stocks for Option 3) GB Cod GOM Cod GB Yellowtail Flounder CC/GOM Yellowtail Flounder SNE/MA Yellowtail Flounder GOM Winter Flounder GB Winter Flounder SNE/MA Winter Flounder White Hake GOM Haddock GB Haddock Witch Flounder American Plaice Pollock Acadian Redfish
Page 3 of 14
Juvenile size threshold Age 0 and 1 length (90th percentile, cm) 24 (Sp), 34 (Fa) 24 (Sp), 34 (Fa)
Length at 20% female maturity (cm) (re-estimated by CATT) 36 36
13 (Sp), 15 (Fa)
25
13 (Sp), 15 (Fa)
25
13 (Sp), 15 (Fa)
25
18 (Sp), 28 (Fa)
27
18 (Sp), 28 (Fa)
27
18 (Sp), 28 (Fa)
27
34 (Sp), 39 (Fa) 24 (Sp), 34 (Fa) 24 (Sp), 34 (Fa) 20 (Sp), 19 (Fa) 12 (Sp), 18 (Fa) 23 (Sp), 32 (Fa) 14 (Sp), 13 (Fa)
25 28 28 28 24 39 19
Vulnerability of species (Bmsy/B)1
Subpopulations2
Residency3
Substrate4
Final Weighting Sum
14.11 5.53
2 3
1 1
3 3
20.11 12.53
9.39
1
2
1
13.39
4.21
1
2
1
8.21
0.77
1
2
1
4.77
UNK
UNK
2
1
10.04
1.22
3
2
1
7.22
6.17 1.21 1.71 0.75 2.45 1.70 0.46 0.76
3 UNK 1 1 3 UNK 2 1
2 2 1 1 2 1 2 2
1 1 3 3 1 1 2 3
12.17 6.04 6.71 5.75 8.45 5.54 6.46 6.76
Updated May 14, 2013
Comparative metrics summary Stock (Red cells indicate selected stocks for Option 3) Atlantic Halibut Ocean Pout Northern (GOMGB) Windowpane Flounder Southern (SNEMA) Windowpane Flounder Atlantic Wolffish Sum Mean
Juvenile size threshold Age 0 and 1 length (90th percentile, cm) see winter flounder 29
Length at 20% female maturity (cm) (re-estimated by CATT)
Vulnerability of species (Bmsy/B)1
Subpopulations2
Residency3
Substrate4
Final Weighting Sum
28.82 12.05
UNK UNK
2 1
2 2
34.66 16.88
3.48
UNK
2
1
8.31
0.69 3.48
UNK UNK
2 UNK
1 2
5.21
1.83
1.68
1.70
5.52 8.99 208.52 10.43
NA 296
see yellowtail flounder
18
see yellowtail flounder
18
47
477
Spawner hotspot weights
Stock
GB Cod GOM Cod GB Yellowtail Flounder CC/GOM Yellowtail Flounder SNE/MA Yellowtail Flounder GOM Winter Flounder GB Winter Flounder SNE/MA Winter Flounder White Hake GOM Haddock GB Haddock Witch Flounder American Plaice Pollock Acadian Redfish Atlantic Halibut Ocean Pout Northern (GOMGB) Windowpane Flounder Southern (SNEMA) Windowpane Flounder Atlantic Wolffish Sum Mean
Page 4 of 14
Large spawner threshold (20% of total biomass)
Length at 80% female maturity (cm) (reestimated by CATT)
Vulnerability of species (Bmsy/B)1
Subpopulations2
Residency3
Final weighting Sum4
Spring multiplier
Summer multiplier
Fall multiplier
Winter multiplier
75 75
52 52
14.11 5.53
2 3
1 1
17.1 9.5
1 1
1 1
0 0
1 1
40
30
9.39
1
2
12.4
1
0
0
0
40
30
4.21
1
2
7.2
1
0
0
0
40
30
0.77
1
2
3.8
1
0
0
0
45
31
UNK
UNK
2
9.0
1
0
0
1
45
31
1.22
3
2
6.2
1
0
0
1
45
31
6.17
3
2
11.2
1
0
0
1
75 50 50 45 40 75 30 45 60
45 40 40 32 52 25 NA NA
1.21 1.71 0.75 2.45 1.70 0.46 0.76 28.82 12.05
UNK 1 1 3 UNK 2 1 UNK UNK
2 1 1 2 1 2 2 2 1
5.0 3.7 2.7 7.5 4.5 4.5 3.8 32.7 14.9
1 1 1 1 1 0 1 1 0
0 0 0 1 0 0 1 1 1
0 0 0 1 0 0 0 1 1
0 0 0 0 0 1 0 1 1
30
24
3.48
UNK
2
7.3
1
1
1
1
30
24
0.69
UNK
2
4.5
1
1
1
1
45
NA
3.48
UNK
UNK
1 18
0 8
0 5
0 10
5.21
1.83
1.68
7.0 174.5 8.73
Updated May 14, 2013
Comparative metrics summary c. Caveats and future work The spatial distribution of survey effort across the region is far from uniform across space or season. It is not possible to detect hotspots in areas with no survey effort. However, sensitivity analyses indicated that hotspot detection is not sensitive to sampling density, except where tows are so widely spaced that there are very few or no neighboring tows. Datasets that can be used to calculate skate hotspots have been developed, but these hotspots have not been generated. This may be done as part of the analysis for the amendment but is not planned for the immediate future. 4.0
Economic metrics a. Areas evaluated
This analysis compares gears used between new juvenile groundfish areas and new adverse effects habitat areas that are currently open to fishing. b. Methods The goal of this analysis is to summarize net revenue by gear type for various management area proposals. These net revenue estimates represent maximum displaced revenue, as effort could increase in another area to catch the same amount of fish and generate the same amount of net revenue overall. Vessel trip reports are used as the basis for the analysis because they cover all fisheries. However, due to concerns raised by the Groundfish PDT and others about attributing the full revenue from a trip to the single coordinate associated with each VTR, a more sophisticated method for spatially attributing revenues was developed. Models were developed to estimate the likely distribution of fishing effort on a particular trip by comparing tow locations on observed trips with the VTR points associated with those trips. Specifically, distances between the VTR point and observed hauls were used to generate confidence intervals around the VTR points. A separate model was developed for each gear type that included attributes such as trip duration and region (other variables were tested as well but these three had the greatest influence). The confidence intervals were calculated for five percentiles of observed tows: 25, 50, 75, 90, and 95, and are represented spatially as rings around each VTR location. Thus, 25% of the tows occur in the 25th percentile ring, 50% of the tows occur within the 50th percentile ring, and so on. In general, the radius of the rings increased with each successive percentile. The 95th percentile rings had very large radii, so when revenue were attributed to the spatial rings, these largest rings were dropped and the revenues assigned to the 90th percentile ring. Note that the rings are represented as donuts, not as overlapping circles.
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Updated May 14, 2013
Comparative metrics summary Revenue for a trip was then attributed proportional to the distribution of tows. VTR points and their associated confidence rings were plotted spatially, and the portions of the confidence rings that overlapped a particular management area were included in the total revenue estimate for that management area. The following figure illustrates the concept. The Cox Ledge habitat management areas are show in black. Two trips are represented by the colored concentric rings. The southwestern trip’s revenue is attributed to a larger area based on the gear type/location/duration model, while revenue from the northeastern trip is attributed over a much smaller area. The 90th percentile confidence ring from the southwestern trip overlaps the management area only slightly, so a small fraction of its revenue is associated with the management area. A greater proportion of the northeastern trip’s four confidence rings overlap the area and therefore a large proportion of the trip’s revenue is associated with Cox Ledge.
c. Caveats and future work Although this approach will allocate some effort to areas in which it does not occur, this is a drawback to all spatial analysis relying on the VTR data. This approach will give a more realistic estimate of revenue distribution as compared to a simple gridding of VTR data. It should be noted that an assumption of the method is that revenue is distributed evenly across tows.
Page 6 of 14
Updated May 14, 2013
Comparative metrics summary Eventually, it should be possible to estimate net revenue (gross revenue less variable trip costs) by management area. These revenues can be disaggregated by factors such as gear type, state, and year. Disaggregation by gear type will be particularly important as fishing restrictions will be applied by gear. As mentioned above, these revenue estimates measure potential displacement of effort. As alternative combinations of area management options are developed, it will be possible to assess the potential for these revenues to be redistributed to other nearby areas. 5.0
Diversity metrics a. Areas evaluated
This analysis compares diversity metrics for current groundfish areas, current habitat areas, new juvenile groundfish areas, and new and modified spawning protection areas. b. Methods Three sets of indices were calculated as follows for the 2002-2012 spring and fall NMFS trawl survey data. The Shannon Diversity Index is a measure of both species richness and the number of individuals of each species in a sample. This index is most sensitive to changes in the number of rare species in a sample. The Simpson Index is most sensitive to changes in the number and abundance of dominant species in a sample. The calculated Simpson indices were inverted so that the index represents the probability that any two individuals drawn from a sample are members of different species. Note that sample size varies considerably between the areas. Shannon index No upper limit on index – maximum value for this data set was 2.944. Larger values indicate greater species diversity. All species caught in the tow, including large mesh groundfish, other regulated species, and other type of fish and invertebrates that are listed individually in the data (e.g. sculpins).
Inverted Simpson index Ranges from 0-1, with indices closer to 1 including more of the listed species in a given tow.
All large mesh groundfish: cod, haddock, yellowtail, redfish, winter flounder, American plaice, windowpane, white hake, pollock, halibut, witch flounder, wolffish
All regulated species: large mesh groundfish plus spiny dogfish, all skates, herring, offshore hake, silver hake, and red hake, summer flounder, mackerel, butterfish, black sea bass, tautog, monkfish, lobster, northern shrimp, sea scallop, shortfin squid, and longfin squid
c. Caveats and future work This analysis will be extended to include the new habitat management areas and DHRAs. Page 7 of 14
Updated May 14, 2013
Comparative metrics summary Figure 1 – Current groundfish management areas
Page 8 of 14
Updated May 14, 2013
Comparative metrics summary Figure 2 – Status quo habitat management areas
Page 9 of 14
Updated May 14, 2013
Comparative metrics summary Figure 3 – New juvenile groundfish habitat areas
Page 10 of 14
Updated May 14, 2013
Comparative metrics summary Figure 4 – New EFH adverse effects minimization habitat management areas
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Updated May 14, 2013
Comparative metrics summary Figure 5 – New dedicated habitat research areas
Page 12 of 14
Updated May 14, 2013
Comparative metrics summary Figure 6 – New seasonal spawning groundfish management areas
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Updated May 14, 2013
Comparative metrics summary Figure 7 – Modified rolling closure areas. The status quo groundfish management areas are shown for reference.
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Updated May 14, 2013
Table 1 – List of areas with existing and potential management measures and area size Area type
Area name
Focus
Season
Gear types restricted
Status Quo Groundfish Management Areas
Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I Nantucket Lightship Jeffreys Bank Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I N Closed Area I S Nantucket Lightship Machias Eastern Maine Toothaker Ridge Jeffreys Bank modified Platts Bank Cashes Ledge modified Ammen Rock Fippennies Ledge Bigelow Bight Jeffreys Ledge Stellwagen Mass Bay Cape Cod Bay Northern Edge Georges Shoal East Georges Shoal West Southern Closed Area II Great South Channel Core + ABCDEF Great South Channel Core + CDEF Great South Channel Core + DEF Cox Ledge Coastal Gulf of Maine 15nm/90m Eastern Maine DHRA Georges Bank DHRA
Various, including spawning protection
Year round
Gear capable of catching groundfish
Adverse effects minimization
Year round
Mobile bottom tending gear
Juvenile groundfish Juvenile groundfish Juvenile groundfish Adverse effects minimization Adverse effects minimization Adverse effects minimization Adverse effects minimization Adverse effects minimization Juvenile groundfish Adverse effects minimization Adverse effects minimization Juvenile groundfish Juvenile groundfish Juvenile groundfish Adverse effects minimization Adverse effects minimization Juvenile groundfish Adverse effects minimization Adverse effects minimization Adverse effects minimization Adverse effects minimization Juvenile groundfish Habitat research Habitat research
Year round
Mobile bottom tending gear
Year round
Under development
Status Quo Habitat Management Areas
New or modified Habitat Management Areas or Juvenile Groundfish Management Areas
DHRAs
Analysis metrics summary tables – Page 15
Square kilometers
Square miles
1377 3030 3951 6916 6263 499 443 2272 1937 584 641 3387 872 1398 700 494 73 324 15 45 2575 733 670 1591 676 171 575 912 1499 3022 2566 2387 213 15715 483 584
532 1170 1525 2670 2418 193 171 877 748 225 248 1308 337 540 270 191 28 125 6 17 994 283 259 614 261 66 222 352 579 1167 991 922 82 6068 186 225
Square nautical miles 402 883 1152 2016 1826 145 129 662 565 170 187 987 254 408 204 144 21 94 4 13 751 214 195 464 197 50 168 266 437 881 748 696 62 4582 141 170
Updated May 14, 2013
Area type
New seasonal spawning areas
Modified seasonal spawning areas
Area name
Focus
Season
Gear types restricted
SERA II DHRA Cashes Ledge Spawner East Cashes 55 Fathom Bunch Cape Elizabeth Boone Island Scantum Jeffreys Ledge Spawner Massachusetts Bay Spawner Wildcat Knoll Scituate Howell Swell Northern Edge Spawner Southeast Part Spawner Southwest Part Vinyard Sound Pout 1 Pout 2 March-April Rolling Closure Mod May Rolling Closure Mod June Rolling Closure Mod CAII Spring Spawner WGOM Spring Spawner
Habitat research Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection
Summer Summer Summer Spring Spring Spring Spring Spring Spring Winter Summer Spring Spring Winter Spring Winter Winter March-April May June Spring Spring
Gear capable of catching groundfish
Gear capable of catching groundfish Gear capable of catching groundfish
Square kilometers
Square miles
1177 4102 1857 400 400 300 400 800 1076 500 200 400 1539 2700 200 564 200 300 8032 6668 3385 6916 3030
Square nautical miles
454 1584 717 154 154 116 154 309 415 193 77 154 594 1042 77 218 77 116 3101 2575 1307 2670 1170
343 1196 541 117 117 87 117 233 314 146 58 117 449 787 58 164 58 87 2342 1944 987 2016 883
Table 2 – List of areas with habitat vulnerability scoring for bottom trawl gear type. Area type
Area name
Status Quo Groundfish Management Areas
Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I Nantucket Lightship Jeffreys Bank
Status Quo
Total Zinf 1186.1 2362.7 4025.3 2556.1 3614.8 510.1
Analysis metrics summary tables – Page 16
100 km^2 grid analysis Total Zinf Vulnerability overlapping per category area 100 km^2 2500.0 47.44 Above average 4800.0 49.22 Above average 8612.4 46.74 Above average 5500.0 46.47 Above average 7800.0 46.34 Above average 900.0 56.68 Very high
Notes Overlap with LISA cluster No Yes Yes No No Yes
Large cobble/boulder polygons skew vulnerability results
Updated May 14, 2013
Area type Habitat Management Areas
New or modified Habitat Management Areas or Juvenile Groundfish Management Areas
DHRAs
Area name Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I N Closed Area I S Nantucket Lightship Machias Eastern Maine Toothaker Ridge Jeffreys Bank modified Platts Bank Cashes Ledge modified Ammen Rock Fippennies Ledge Bigelow Bight Jeffreys Ledge Stellwagen Bank Mass Bay Cape Cod Northern Edge Georges Shoal East Georges Shoal West Southeast Part Great South Channel ABCDEF Great South Channel CDEF Great South Channel DEF Cox Ledge Coastal Juvenile Area Eastern Maine DHRA Georges Bank DHRA SERA II DHRA
Total 588.1 1822.6 735.8 1242.9 609.7 2179.8 157.0 651.6 333.5 688.9 359.1 400.8 61.2 201.2 977.4 802.9 681.9 540.3 109.2 568.2 1053.1 684.1 2162.6 1857.0 1736.4 282.4 609.7 1031.7 499.4
Analysis metrics summary tables – Page 17
-
100 km^2 grid analysis Total Zinf Vulnerability 1200.0 49.01 Above average 3700.0 49.26 Above average 1491.5 49.34 Above average 2700.0 46.03 Below average 1300.0 46.90 Above average 4644.7 46.93 Above average 327.2 47.97 Above average 1266.4 51.45 High 700.0 47.65 Above average 1200.0 57.41 Very high 500.0 71.82 Very high 800.0 50.11 Above average 100.0 61.20 Very high 400.0 50.29 Above average 1908.7 51.21 High 1600.0 50.18 Above average 1400.0 48.71 Above average 1143.2 47.26 Above average 228.8 47.71 Above average 1100.0 51.66 High 2000.0 52.66 High 1500.0 45.61 Below average 4200.0 51.49 High 3600.0 51.58 High 3400.0 51.07 High 600.0 47.06 Above average
Overlap No Yes Yes No No No No Yes Yes Yes Yes No No No Yes Yes Yes No Yes Yes Yes No Yes Yes Yes No
1300.0 2100.0 877.3
Yes No Yes
46.90 49.13 56.92
Above average Above average Very high
Notes
Low data quality Low data quality Large cobble/boulder polygons skew vulnerability results Large cobble/boulder polygons skew vulnerability results
Completely outside model domain
Low data quality Equivalent to CAI S habitat closure
Updated May 14, 2013
Table 3 – List of areas with habitat attributes including data quality and number of grids in the substrate model, depth, and percent of grids with a particular dominant substrate type. Mean data quality
Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I Nantucket Lightship Jeffreys Bank
Number of Voronoi grids 202 964 3007 2697 3695 45
5.2 3.5 6.3 6.5 6.6 5.0
Unstructured (Voronoi) grd analysis Mean Percentage of Voronoi grids identifed as having a depth particular dominant substrate Mud Sand Granule- Cobble Boulder pebble -102.4 19% 38% 3% 20% 19% -90.6 16% 67% 2% 13% 2% -61.4 1% 65% 6% 28% 0% -72.0 1% 76% 3% 20% 0% -61.5 2% 80% 2% 16% 0% -108.9 22% 16% 27% 11% 24%
Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I N Closed Area I S Nantucket Lightship Machias Eastern Maine Toothaker Ridge Jeffreys Bank modified
98 939 1217 676 290 653 62 197 20 45
4.9 3.6 6.8 6.1 6.2 5.1 3.1 2.8 2.0 5.3
-103.6 -87.8 -54.2 -94.6 -61.7 -42.2 -68.4 -89.0 -114.0 -105.7
22% 15% 0% 2% 1% 2% 31% 75% 80% 16%
30% 68% 27% 91% 87% 93% 45% 6% 5% 18%
2% 2% 13% 0% 1% 1% 5% 4% 0% 27%
14% 13% 59% 6% 11% 4% 19% 16% 15% 9%
32% 2% 1% 0% 0% 0% 0% 0% 0% 31%
80
6.2
-77.6
3%
45%
16%
20%
16%
93 28 61 535 190 614 1667
5.1 6.5 6.2 3.0 4.0 3.6 4.1
-99.6 -68.9 -84.3 -93.9 -92.9 -75.9 -48.1
18% 0% 0% 63% 26% 2% 7%
31% 25% 51% 12% 36% 86% 89%
2% 7% 8% 6% 7% 0% 0%
15% 11% 30% 19% 23% 11% 4%
33% 57% 11% 0% 9% 0% 0%
Area type
Area name
Status Quo Groundfish Management Areas Status Quo Habitat Management Areas
New or modified Habitat Management Areas or Juvenile Groundfish Management Areas
Platts Bank Cashes Ledge modified Ammen Rock Fippennies Ledge Bigelow Bight Jeffreys Ledge Stellwagen Bank Mass Bay Cape Cod Northern Edge Georges Shoal East Georges Shoal West Southeast Part Great South Channel
-
145 770 489 414 2018
Analysis metrics summary tables – Page 18
6.6 6.6 5.1 6.0 5.6
-86.6 -29.7 -29.5 -67.3 -47.5
1% 0% 0% 1% 0%
61% 27% 58% 98% 52%
6% 21% 16% 0% 17%
30% 51% 25% 1% 27%
Notes
Large cobble/boulder polygons skew vulnerability results
Low data quality Low data quality Large cobble/boulder polygons skew vulnerability results Large cobble/boulder polygons skew vulnerability results
Non-SASI multibeam data Completely outside model domain
1% 1% 1% 0% 3%
Updated May 14, 2013
Area type
DHRAs
Area name
Unstructured (Voronoi) grd analysis Mean Percentage of Voronoi grids identifed as having a depth particular dominant substrate Mud Sand Granule- Cobble Boulder pebble
Number of Voronoi grids
Mean data quality
1616 1461 61
5.5 5.4 4.8
-27.9 -26.6 -37.6
0% 0% 8%
55% 58% 70%
25% 23% 3%
17% 16% 13%
2% 2% 5%
60 290 703
2.8 6.2 3.5
-84.0 -61.7 -81.7
58% 1% 5%
5% 87% 83%
10% 1% 1%
27% 11% 12%
0% 0% 0%
ABCDEF Great South Channel CDEF Great South Channel DEF Cox Ledge Coastal Juvenile Area Eastern Maine DHRA Georges Bank DHRA SERA II DHRA
Notes
Low data quality Equivalent to CAI S habitat closure Non-SASI multibeam data relied on for substrate assessment
Table 4 - Juvenile groundfish hotspot summary Juvenile hotspots Area type Area name Status Quo Groundfish Management Areas
Status Quo Habitat Management Areas
New or modified
Spring Number Weight
Summer Number Weight
Fall Number Weight
Winter Number Weight
Total Number Weight
Cashes Ledge
1
6.71
16
85.54
12
47.32
4
26.84
33
166.41
Western Gulf of Maine
84
305.38
49
228.72
67
388.81
1
6.71
201
929.62
Closed Area II Closed Area I Nantucket Lightship
11 0
63.25 0.00
39 0
195.50 0.00
16 35
28.75 27.79
0 0
0.00 0.00
66 35
287.50 27.79
16
0.00
79
5.75
1
0.00
4
40.22
100
45.97
Jeffreys Bank Cashes Ledge
7 1
20.28 6.71
39 2
0.00 11.08
22 2
33.80 6.76
0 0
0.00 0.00
68 5
54.08 24.55
70 0
305.38 0.00
32 5
194.92 0.00
56 4
337.17 11.50
1 0
6.71 0.00
159 9
844.18 11.50
0 0
0.00 0.00
0 0
0.00 0.00
10 0
17.04 0.00
0 0
0.00 0.00
10 0
17.04 0.00
10 116 144
0.00 606.66 33.80
54 0 3
0.00 0.00 0.00
0 41 350
0.00 287.85 703.04
2 0 0
40.22 0.00 0.00
66 157 497
40.22 894.51 736.84
Western Gulf of Maine Closed Area II Closed Area I N Closed Area I S Nantucket Lightship Machias Eastern Maine
Analysis metrics summary tables – Page 19
Species
Redfish, plaice, monkfish, haddock, red hake, silver hake Redfish, plaice, cod, monkfish, haddock, red hake, silver hake, white hake, winter flounder, witch flounder Haddock, red hake, windowpane, winter flounder Plaice, haddock, red hake, silver hake Cod, monkfish, haddock, red hake, silver hake, windowpane Redfish, red hake, silver hake, white hake, witch Redfish, plaice, haddock, silver hake Redfish, plaice, cod, monkfish, haddock, red hake, silver hake, white hake, winter flounder, witch flounder Haddock, red hake, winter flounder Plaice, haddock, red hake No juvenile hotspots Cod, monkfish, red hake, silver hake Cod, haddock, halibut Redfish, alewife, silver hake, white hake,
Updated May 14, 2013
Juvenile hotspots Area type Area name Habitat Management or Juvenile Groundfish Management Areas
DHRAs
Spring Number Weight
Summer Number Weight
Fall Number Weight
Winter Number Weight
Total Number Weight
Species
windowpane, winter flounder, witch flounder Toothaker Ridge Jeffreys Bank modified Platts Bank Cashes Ledge modified Ammen Rock Fippennies Ledge
43
81.12
33
0.00
69
128.44
0
0.00
145
209.56
0 0
0.00 0.00
5 0
0.00 0.00
15 1
27.04 6.76
0 0
0.00 0.00
20 1
27.04 6.76
Redfish, pollock, silver hake, white hake Redfish
1 0
6.71 0.00
2 1
11.08 5.54
2 0
6.76 0.00
0 0
0.00 0.00
5 1
24.55 5.54
Redfish, plaice, haddock, silver hake Plaice
0
0.00
0
0.00
0
0.00
2
13.42
2
13.42
Bigelow Bight Jeffreys Ledge Stellwagen Bank
696 26
2911.17 133.38
106 5
503.08 32.58
659 28
2217.26 152.18
0 0
0.00 0.00
1461 59
5631.51 318.14
5
38.58
1
5.54
9
82.93
0
0.00
15
127.05
Mass Bay
125
1006.64
6
33.24
134
457.55
104
664.09
369
2161.52
Cape Cod Northern Edge Georges Shoal East Georges Shoal West Southeast Part Great South Channel ABCDEF Great South Channel CDEF Great South Channel DEF Cox Ledge Coastal juvenile area Eastern Maine DHRA Georges Bank DHRA
125 0
801.92 0.00
0 0
0.00 0.00
88 6
0.00 28.75
0 0
0.00 0.00
213 6
801.92 28.75
Haddock Redfish, alewife, plaice, cod, monkfish, haddock, pout, pollock, red hake, silver hake, white hake, winter flounder, witch flounder, yellowtail flounder Redfish, plaice, monkfish, silver hake Redfish, plaice, cod, white hake, winter flounder Plaice, herring, cod, pollock, silver hake, white hake, winter flounder, yellowtail Cod, red hake, silver hake, white hake, windowpane, winter flounder, yellowtail Haddock, red hake
0
0.00
9
0.00
7
0.00
0
0.00
16
0.00
Red hake, windowpane, winter flounder
0 5
0.00 28.75
0 31
0.00 178.25
2 0
0.00 0.00
0 0
0.00 0.00
2 36
0.00 207.00
0
0.00
0
0.00
6
0.00
0
0.00
6
0.00
Winter flounder
0
0.00
0
0.00
6
0.00
0
0.00
6
0.00
Winter flounder
0 0
0.00 0.00
0 0
0.00 0.00
5 0
0.00 0.00
0 0
0.00 0.00
5 0
0.00 0.00
Winter flounder No juvenile hotspots
1523
5121.54
47
220.28
1659
3164.37
112
588.91
3341
9095.10
41
0.00
0
0.00
110
229.84
0
0.00
151
229.84
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
Analysis metrics summary tables – Page 20
Redfish, witch
Red hake Haddock, yellowtail
All species Redfish, silver hake, white hake, windowpane, winter flounder, witch No juvenile hotspots
Updated May 14, 2013
Juvenile hotspots Area type Area name
New seasonal spawning areas
Modified seasonal spawning areas
Spring Number Weight
Summer Number Weight
Fall Number Weight
Winter Number Weight
Total Number Weight
Species
SERA II DHRA Cashes Ledge Spawner East Cashes 55 Fathom Bunch
24
112.94
6
28.92
17
123.49
1
6.71
48
272.06
Redfish, plaice, cod, haddock, red hake, silver hake, white hake, winter flounder
6 4
6.71 0.00
22 5
100.28 13.52
31 12
60.84 6.76
0 0
0.00 0.00
59 21
167.83 20.28
Redfish, witch Redfish, witch
0
0.00
4
27.04
2
6.76
0
0.00
6
33.80
Cape Elizabeth
149
459.95
7
19.06
168
447.12
6
0.00
330
926.13
Boone Island
114
485.86
4
25.82
118
429.71
0
0.00
236
941.39
Scantum Jeffreys Ledge Spawner Mass Bay Spawner Wildcat Knoll
78
409.87
26
90.42
67
245.90
1
0.00
172
746.19
35
153.86
14
35.68
29
149.08
1
6.71
79
345.33
125 10
612.59 125.30
12 0
66.48 0.00
94 10
241.38 100.24
15 11
87.71 75.18
246 31
1008.16 300.72
36 0
176.61 0.00
0 0
0.00 0.00
3 0
0.00 0.00
0 0
0.00 0.00
39 0
176.61 0.00
0
0.00
14
0.00
19
40.25
0
0.00
33
40.25
9
51.75
15
86.25
3
0.00
0
0.00
27
138.00
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
Scituate Howell Swell Northern Edge Spawner Southeast Part Spawner Southwest Part Vineyard Sound Ocean Pout 1 Ocean Pout 2 March April Modified Rolling
58 0 0
0.00 0.00 0.00
0 0 0
0.00 0.00 0.00
1 0 0
0.00 0.00 0.00
0 6 4
0.00 0.00 0.00
59 6 4
0.00 0.00 0.00
646
3192.18
159
728.90
662
2045.54
131
720.92
1598
6687.54
May Modified Rolling
844
3545.78
209
970.48
737
2520.43
23
31.77
1813
7068.46
June Modified Rolling
456
1672.84
63
313.60
447
1451.93
2
0.00
968
3438.37
Analysis metrics summary tables – Page 21
Redfish, witch Redfish, alewife, plaice, monkfish, haddock, pollock, red hake, silver hake, white hake, witch Redfish, plaice, monkfish, haddock, pout, red hake, silver hake, witch Redfish, plaice, cod, haddock, ocean pout, pollock, red hake, silver hake, white hake, witch Redfish, plaice, haddock, red hake, silver hake Redfish, plaice, cod, red hake, white hake, windowpane, winter flounder, yellowtail Cod, winter flounder Plaice, cod, monkfish, red hake, white hake, winter flounder Redfish, witch Haddock, red hake, windowpane, winter flounder Haddock, red hake No juvenile hotspots Red hake, silver hake, windowpane, winter flounder Winter flounder Silver hake Redfish, plaice, cod, haddock, pout, pollock, red hake, silver make, white hake, winter flounder, witch, yellowtail Redfish, alewife, plaice, herring, cod, monkfish, haddock, pout, pollock, red hake, silver hake, white hake, winter flounder, witch, yellowtail Redfish, alewife, plaice, cod, monkfish, haddock, pout, pollock, red hake, silver hake, white hake, winter flounder, witch
Updated May 14, 2013
Juvenile hotspots Area type Area name
Spring Number Weight
Summer Number Weight
Fall Number Weight
Winter Number Weight
Total Number Weight
Species
flounder
CA2 Spring Spawner
11
63.25
39
195.50
16
28.75
1
6.71
67
294.21
WGoM Spring Spawner
97
549.75
24
0.00
42
22.44
3
0.00
166
572.19
Haddock Redfish, plaice, cod, monkfish, haddock, red hake, silver hake, white hake, witch flounder
Table 5 - Spawner hotspot summary Spawner hotspot Area type Area name Status Quo Cashes Ledge Groundfish Management Western Gulf Areas of Maine
Status Quo Habitat Management Areas
New or modified Habitat Management or Juvenile Groundfish Management Areas
Spring Number Weight 7 15.04
Summer Number Weight 3 11.28
Fall Number Weight 11 14.90
Winter Number Weight 0 0.00
Total Number Weight 21 41.22
Species Redfish, red hake, witch Alewife, plaice, cod, haddock, pollock, red hake, silver hake, white hake, witch, yellowtail Cod, haddock, red hake, windowpane, winter flounder, yellowtail Redfish, alewife, plaice, haddock, pout, red hake, silver hake, winter flounder, yellowtail
104
391.40
30
0.00
82
0.00
19
28.50
235
419.90
Closed Area II
97
549.75
24
0.00
42
22.44
3
0.00
166
572.19
Closed Area I Nantucket Lightship Jeffreys Bank Cashes Ledge
2
6.46
15
0.00
23
15.05
0
0.00
40
21.51
0 0 0
0.00 0.00 0.00
2 0 2
0.00 0.00 7.52
0 0 2
0.00 0.00 7.45
6 0 0
28.14 0.00 0.00
8 0 4
28.14 0.00 14.97
79 5
341.60 13.50
12 0
0.00 0.00
61 0
0.00 0.00
19 0
28.50 0.00
171 5
370.10 13.50
1
3.76
1
0.00
16
0.00
0
0.00
18
3.76
Redfish, plaice, herring, haddock, red hake
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
No hotspots
0 0
0.00 0.00
0 0
0.00 0.00
0 2
0.00 0.00
0 0
0.00 0.00
0 2
0.00 0.00
No hotspots Cod
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
No spawner hotspots
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
Redfish, witch
0 1 0
0.00 0.00 0.00
1 0 2
7.45 0.00 7.52
0 1 2
0.00 0.00 7.45
0 0 0
0.00 0.00 0.00
1 2 4
7.45 0.00 14.97
Western Gulf of Maine Closed Area II Closed Area I N Closed Area I S Nantucket Lightship Machias Eastern Maine Toothaker Ridge Jeffreys Bank modified Platts Bank Cashes Ledge
Analysis metrics summary tables – Page 22
cod, haddock, windowpane Witch Redfish, red hake, witch Plaice, herring, cod, haddock, pollock, red hake, silver hake, white hake, witch, yellowtail Haddock
Witch Red hake, silver hake Redfish, red hake, witch
Updated May 14, 2013
Spawner hotspot Area type Area name modified Ammen Rock Fippennies Ledge
DHRAs
New seasonal spawning areas
Spring Number Weight
Summer Number Weight
Number
Fall Weight
Winter Number Weight
Total Number Weight
Species
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
No spawner hotspots
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
Bigelow Bight Jeffreys Ledge Stellwagen Bank
226
304.50
38
0.00
186
0.00
0
0.00
450
304.50
23
66.70
3
0.00
33
0.00
9
28.50
68
95.20
20
128.30
2
0.00
8
0.00
3
0.00
33
128.30
Mass Bay Cape Cod Northern Edge Georges Shoal East Georges Shoal West Southeast Part Great South Channel ABCDEF Great South Channel CDEF Great South Channel DEF Cox Ledge
37 2
177.05 0.00
5 0
0.00 0.00
40 5
0.00 0.00
3 0
28.50 0.00
85 7
205.55 0.00
No spawner hotspots Redfish, alewife, plaice, halibut, dod, haddock, pollock, red hake, silver hake, yellowtail Plaice, cod, haddock, pollock, red hake, silver hake, white hake, yellowtail Plaice, cod, haddock, pollock, red hake, white hake, witch Plaice, halibut, cod, haddock, pout, red hake, silver hake Pout, red hake, silver hake
2
19.80
0
0.00
11
0.00
0
0.00
13
19.80
6
30.60
2
0.00
4
22.44
0
0.00
12
53.04
Halibut, cod, haddock, red hake Herring, cod, haddock, windowpane, winter flounder
0
0.00
0
0.00
3
22.44
0
0.00
3
22.44
Windowpane
28
182.19
0
0.00
11
0.00
0
0.00
39
182.19
6
14.10
0
0.00
0
0.00
0
0.00
6
14.10
Plaice, herring
6
14.10
0
0.00
0
0.00
0
0.00
6
14.10
Plaice, herring
6 0
14.10 0.00
0 0
0.00 0.00
0 0
0.00 0.00
0 0
0.00 0.00
6 0
14.10 0.00
339
674.81
19
0.00
288
37.31
9
46.63
655
758.75
Plaice, herring No spawner hotspots Redfish, alewife, plaice, herring, cod, haddock, pout, pollock, red hake, silver hake, windowpane, witch, yellowtail
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
No spawner hotspots
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
46
256.10
19
0.00
6
0.00
10
0.00
81
256.10
No spawner hotspots Plaice, cod, haddock, pollock, red hake, silver hake, white hake, witch
23 12
41.36 26.32
53 33
206.52 127.70
20 4
14.90 0.00
0 0
0.00 0.00
96 49
262.78 154.02
Redfish, witch Redfish, witch
1
0.00
14
52.64
2
0.00
0
0.00
17
52.64
Redfish, witch
Coastal juvenile Eastern Maine DHRA Georges Bank DHRA SERA II DHRA Cashes Ledge Spawner East Cashes 55 Fathom Bunch
Analysis metrics summary tables – Page 23
Haddock, yellowtail
Updated May 14, 2013
Spawner hotspot Area type Area name Cape Elizabeth
Modified seasonal spawning areas
Spring Number Weight
Summer Number Weight
Number
Fall Weight
Winter Number Weight
Total Number Weight
Species Redfish, alewife, plaice, herring, red hake, silver hake Redfish, plaice, herring, red hake, silver hake, yellowtail Redfish, plaice, herring, cod, red hake, silver hake, yellowtail
72
89.30
1
0.00
42
0.00
0
0.00
115
89.30
Boone Island
41
75.20
1
0.00
41
0.00
0
0.00
83
75.20
Scantum Jeffreys Ledge Spawner Mass Bay Spawner
28
99.00
9
0.00
36
0.00
0
0.00
73
99.00
47
213.60
7
0.00
34
0.00
12
28.50
100
242.10
77
419.10
0
0.00
24
14.96
0
0.00
101
434.06
Wildcat Knoll
19
117.80
0
0.00
9
0.00
0
0.00
28
117.80
Scituate Howell Swell Northern Edge Spawner Southeast Part Spawner Southwest Part Vineyard Sound Ocean Pout 1 Ocean Pout 2 March April Modified Rolling May Modified Rolling June Modified Rolling CA2 Spring Spawner WGoM Spring Spawner
6 0
4.70 0.00
0 13
0.00 48.88
18 1
0.00 0.00
3 0
28.50 0.00
27 14
33.20 48.88
16
75.52
2
0.00
16
22.44
0
0.00
34
97.96
66
415.54
18
0.00
21
0.00
2
0.00
107
415.54
0
0.00
0
0.00
0
0.00
4
37.58
4
37.58
37 0 0
149.65 0.00 0.00
0 0 0
0.00 0.00 0.00
0 4 1
0.00 0.00 4.69
0 6 5
0.00 90.30 75.25
37 10 6
149.65 90.30 79.94
287
999.21
68
0.00
311
37.31
28
74.84
694
1111.36
348
879.94
83
9.50
306
37.31
23
46.34
760
973.09
172
212.32
29
9.50
124
0.00
0
0.00
325
221.82
84
305.38
49
228.72
67
388.81
1
6.71
201
929.62
Redfish, alewife, plaice, herring, red hake, silver hake, yellowtail Cod, haddock, windowpane, winter flounder
104
391.40
30
0.00
82
0.00
19
28.50
235
419.90
Plaice, herring, cod, haddock, pollock, red hake, silver hake, witch, yellowtail
Analysis metrics summary tables – Page 24
Plaice, cod, haddock, pollock, red hake, silver hake, white hake, yellowtail Redfish, plaice, herring, cod, haddock, red hake, silver hake, windowpane, yellowtail Plaice, cod, haddock, red hake, witch, yellowtail Plaice, herring, cod, red hake, silver hake, yellowtail Redfish, witch Herring, cod, haddock, red hake, windowpane, winter flounder Haddock, windowpane, winter flounder, yellowtail Ocean pout, windowpane, yellowtail Red hake, silver hake, windowpane, winter flounder Pout, yellowtail Pout, windowpane Redfish, plaice, herring, cod, haddock, pout, pollock, red hake, silver hake, windowpane, witch, yellowtail Redfish, plaice, herring, cod, haddock, pollock, red hake, silver hake, windowpane, yellowtail
Updated May 14, 2013
Table 6 – Gears used in area in rank order of total revenue for calendar year 2012. Hydraulic clam dredge gears not listed.
Revenue Area type New or modified Habitat Management or Juvenile Groundfish Management Areas
Area name Machias Eastern Maine Toothaker Ridge Jeffreys Bank modified Platts Bank Cashes Ledge modified Ammen Rock Fippennies Ledge Bigelow Bight Jeffreys Ledge Stellwagen Bank Mass Bay Cape Cod Northern Edge Georges Shoal East Georges Shoal West Southeast Part Great South Channel ABCDEF Great South Channel CDEF Great South Channel DEF Cox Ledge
Analysis metrics summary tables – Page 25
Major gears used, in rank order of total revenue, calendar year 2012 Pot/trap, scallop dredge Pot/trap, purse seine, midwater trawl, bottom trawl, longline Pot/trap, purse seine, midwater trawl, bottom trawl Purse seine, pot/trap, bottom trawl, midwater trawl Not analyzed yet Not analyzed yet - closed to many types of fishing currently Not analyzed yet - closed to many types of fishing currently Not analyzed yet - closed to many types of fishing currently Pot/trap. Bottom trawl, sink gillnet, purse seine, midwater trawl, longline Not analyzed yet - closed to many types of fishing currently Not analyzed yet - closed to many types of fishing currently Not analyzed yet Pot/trap, scallop dredge, bottom trawl, longline, midwater trawl, gillnet Not analyzed yet - closed to many types of fishing currently Scallop dredge, bottom trawl, SAP trawl, pot/trap, longline Otter trawl, scallop dredge, midwater trawl, pot/trap, SAP trawl Not analyzed yet - closed to many types of fishing currently Scallop dredge, sink gillnet, pot/trap, bottom trawl, midwater trawl, longline, harpoon Only largest GSC area evaluated thus far Only largest GSC area evaluated thus far Sink gillnet, bottom trawl, pot/trap, scallop dredge, midwater trawl
Updated May 14, 2013
Table 7 – Diversity indices
Diversity indices Area type
Area
Status Quo Groundfish Management Areas
Cashes Ledge Western Gulf of Maine Closed Area I Closed Area II Nantucket Lightship Jeffreys Bank Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I N Closed Area I S Nantucket Lightship Machias Eastern Maine Toothaker Ridge Jeffreys Bank modified Platts Bank Cashes Ledge modified Ammen Rock Fippennies Ledge Bigelow Bight Jeffreys Ledge Stellwagen Mass Bay Cape Cod Northern Edge Georges Shoal East Georges Shoal West Southeast Part Great South Channel ABCDEF Great South Channel CDEF
Status Quo Habitat Management Areas
New or modified Habitat Management Areas or Juvenile Groundfish Management Areas
Analysis metrics summary tables – Page 26
Number of tows 60 285 403 645 703 71 19 239 132 166 40 296 2 90 25
Shannon Diversity Index All species Mean StDev 1.278 1.352 1.139 1.099 1.092 1.434 1.227 1.297 0.708 1.098 1.395 1.120 1.313 1.649 1.515
0.577 0.542 0.541 0.585 0.641 0.400 0.625 0.542 0.610 0.574 0.467 0.645 0.157 0.452 0.467
Inverted Simpson Diversity Index Large mesh groundfish Regulated groundfish Mean StDev Mean StDev 0.71 0.747 0.981 0.937 0.869 0.827 0.679 0.718 0.957 0.966 0.994 0.859 0.935 0.888 0.971
0.342 0.271 0.075 0.153 0.307 0.184 0.372 0.278 0.145 0.107 0.017 0.317 0.043 0.163 0.072
0.622 0.663 0.576 0.576 0.63 0.726 0.605 0.639 0.358 0.555 0.714 0.694 0.692 0.758 0.860
0.308 0.252 0.291 0.31 0.342 0.199 0.339 0.256 0.328 0.302 0.235 0.332 0.013 0.193 0.225
0.222
0.697
0.214
0.249 0.244 0.174
0.632 0.695 0.340
0.226 0.262 0.319
0.143
0.656
0.266
not yet analyzed
262
1.45
0.448
0.809 not yet analyzed
313 227 39
1.317 1.491 0.678
0.532 0.585 0.585
0.699 0.854 0.926 not yet analyzed
182
1.211
0.506
0.944 not yet analyzed
Updated May 14, 2013
Diversity indices Area type
DHRAs
New seasonal spawning areas
Modified seasonal spawning areas
Area Great South Channel DEF Cox Ledge Coastal Juvenile Area Eastern Maine DHRA Georges Bank DHRA SERA II DHRA Cashes Ledge East Cashes 55 Fathom Bunch Cape Elizabeth Boone Island Scantum Jeffreys Ledge Spawner Mass Bay Spawner Wildcat Knoll Scituate Howell Swell Northern Edge Spawner Southeast Part Spawner Southwest Part Vineyard Sound Ocean Pout 1 Ocean Pout 2 March April Modified Rolling May Modified Rolling June Modified Rolling CA2 Spring Spawner WGoM Spring Spawner
Analysis metrics summary tables – Page 27
Number of tows
1394
Shannon Diversity Index All species Mean StDev
1.517
0.532
Inverted Simpson Diversity Index Large mesh groundfish Regulated groundfish Mean StDev Mean StDev
0.82
0.224
0.707
0.224
0.213
0.749
0.227
0.160 0.202 0.130 0.232 0.248 0.206 0.239 0.310 0.127 0.128 0.175 0.049 0.108 0.362 0.265 0.233 0.238 0.233 0.153 0.271
0.759 0.673 0.777 0.632 0.661 0.676 0.675 0.627 0.824 0.425 0.659 0.885 0.805 0.663 0.714 0.698 0.693 0.707 0.576 0.663
0.164 0.171 0.197 0.205 0.228 0.189 0.207 0.287 0.140 0.342 0.260 0.137 0.211 0.335 0.276 0.222 0.226 0.226 0.310 0.252
not yet analyzed 214
1.484
0.436
4 52 15 60 104 228 48 80 24 211 270 11 177 39 42 1,310 878 201 645 285
1.450 1.500 1.571 1.285 1.377 1.518 1.451 1.292 1.661 0.814 1.281 1.345 1.369 1.347 1.279 1.469 1.440 1.448 1.099 1.352
0.207 0.391 0.386 0.364 0.493 0.436 0.551 0.674 0.279 0.631 0.514 0.700 0.603 0.770 0.663 0.520 0.493 0.477 0.585 0.542
0.851 not yet analyzed 0.799 0.781 0.92 0.686 0.734 0.735 0.741 0.717 0.903 0.960 0.916 0.983 0.971 0.753 0.887 0.777 0.782 0.827 0.937 0.747
Updated May 14, 2013
Comparative metrics summary 1.0
Introduction
The Closed Area Technical Team and Habitat Plan Development Team have developed a series of comparative metrics to help the Committees and Council distinguish between the various area management proposals (see figures later in this document for a summary of management areas). This document summarizes data in four categories – habitat vulnerability and characterization, groundfish hotspots, economics, specifically gear use by area, and species diversity. Not all metrics have been calculated/summarized for all types of areas. These analyses should be viewed as a work in progress and they will be updated with additional information in the coming weeks as additional analyses are completed, and as areas are modified. Additional work is underway to describe groundfish spawning condition, groundfish egg and larval distributions, groundfish distributions (other than hotspots), overlap with protected resources, and potential fishing opportunities within existing closures. 2.0
Habitat metrics a. Areas evaluated
This analysis compares habitat metrics for current groundfish areas, current habitat areas, new juvenile groundfish areas, new adverse effects habitat areas, and new dedicated habitat research areas. b. Methods GIS software was used to determine which output grid cells in the SASI model (100 km2 resolution) overlap with various management areas (see maps). If any portion of a grid cell overlapped any part of a management area, the grid cells were included in the analysis for that area. Total vulnerability to trawl gear of overlapping grids (Zinf) and the total area of overlapping grids in km2 were summed, and area-weighted Zinf was estimated as follows: (total Zinf/total area)*100 = Average overlapping Zinf per 100 km2 These values were then classified as low, below average, above average, high, or very high, according to where they fall on the distribution of Zinf values for the entire model domain. Mean Std deviation Category 2 std dev below
Page 1 of 14
46.80 3.91 Value 38.98
Range < 42.88
Vulnerability Low
Updated May 14, 2013
Comparative metrics summary 1 std dev below mean 1 std dev above 2 std dev above
42.89 46.8 50.71 54.62
42.89-46.79 46.08-50.70 50.71-54.61 > 54.62
Below average Above average High Very high
Next, GIS software was used to determine which unstructured (Voronoi) grid cells in the SASI model overlap with various management areas. If any portion of a grid cell overlapped any part of a management area, the grid cells were included in the analysis for that area. Attributes of these cells were summarized including the number of unstructured grid cells overlapping the area, mean depth, mean data support, and number of cells coded as each of five dominant sediment types. Data Support description Low
Code 1
Moderate
2
High Moderate
3
Very High Moderate
4
High Very High Ultra High
5 6 7
Description Very large grids, only mud, sand, and granule-pebble detectable Large grids, only mud, sand, and granule-pebble detectable Medium grids, only mud, sand, and granule-pebble detectable Small grids, only mud, sand, and granule-pebble detectable Medium grids, all substrate types detectable Small grids, all substrate types detectable Very small grids, all substrate types detectable
c. Caveats and future work Additional work will be done to characterize the uncertainty associated with model results in a given area, and to describe the distribution of substrate within each area. 3.0
Groundfish hotspot metrics a. Areas evaluated
This analysis compares groundfish metrics for current groundfish areas, current habitat areas, new juvenile groundfish areas, new adverse effects habitat areas, new dedicated habitat research areas, and new and modified spawning protection areas. b. Methods The hotspot analysis identifies locations with unusually high catches of juvenile (age 0 and 1) or large spawner-sized groundfish that are within high catch neighborhoods. A separate hotspot analysis was completed for each species and fishery-independent survey (for example, juvenile cod in the NMFS fall trawl survey, or American plaice in the MADMF spring trawl survey). Survey data from 2002-2012 was used in the analysis. Page 2 of 14
Updated May 14, 2013
Comparative metrics summary
Each hotspot was weighted according to factors such as stock status (juveniles and adults), habitat/substrate association (juveniles), and seasonality of spawning (spawners). The weighted hotspots were then aggregated across species and surveys, and gridded at the resolution of the SASI grid (10x10 km cells). The tables in this document list both the total number of hotspots across all species and the weighted value of those hotspots. The number of hotspots represents the number of tows within each management area (summing across species) that are high catch tows in high catch neighborhoods. High weighted values generally indicate that many of these hotspots are associated with high vulnerability stocks, low weighted values generally indicate that many of the hotspots are associated with lower vulnerability stocks. If there is a positive number of hotspots but a weighted value of zero, this indicates that all of the hotspots were zeroed out during the weighting process. This would occur for three reasons: the species is not a large mesh groundfish, the hotspots represent juveniles that are associated with soft sediments, or the hotspots represent large spawners but outside of a species’ known spawning season. To produce the summary tables, gridded hotspots were spatially joined to the management areas in ArcMap. A grid’s hotspots were included with that area if the center point of the 10x10 km grid fell within the area. Large mesh groundfish species are listed in the weighting tables below. Hotspots were also generated for alewife, herring, monkfish, red hake, and silver hake. The summary tables list the species with hotspots in each area, and the number of hotspots includes these additional species, but these species are not included in the weighted values. Juvenile hotspot weights. Stock (Red cells indicate selected stocks for Option 3) GB Cod GOM Cod GB Yellowtail Flounder CC/GOM Yellowtail Flounder SNE/MA Yellowtail Flounder GOM Winter Flounder GB Winter Flounder SNE/MA Winter Flounder White Hake GOM Haddock GB Haddock Witch Flounder American Plaice Pollock Acadian Redfish
Page 3 of 14
Juvenile size threshold Age 0 and 1 length (90th percentile, cm) 24 (Sp), 34 (Fa) 24 (Sp), 34 (Fa)
Length at 20% female maturity (cm) (re-estimated by CATT) 36 36
13 (Sp), 15 (Fa)
25
13 (Sp), 15 (Fa)
25
13 (Sp), 15 (Fa)
25
18 (Sp), 28 (Fa)
27
18 (Sp), 28 (Fa)
27
18 (Sp), 28 (Fa)
27
34 (Sp), 39 (Fa) 24 (Sp), 34 (Fa) 24 (Sp), 34 (Fa) 20 (Sp), 19 (Fa) 12 (Sp), 18 (Fa) 23 (Sp), 32 (Fa) 14 (Sp), 13 (Fa)
25 28 28 28 24 39 19
Vulnerability of species (Bmsy/B)1
Subpopulations2
Residency3
Substrate4
Final Weighting Sum
14.11 5.53
2 3
1 1
3 3
20.11 12.53
9.39
1
2
1
13.39
4.21
1
2
1
8.21
0.77
1
2
1
4.77
UNK
UNK
2
1
10.04
1.22
3
2
1
7.22
6.17 1.21 1.71 0.75 2.45 1.70 0.46 0.76
3 UNK 1 1 3 UNK 2 1
2 2 1 1 2 1 2 2
1 1 3 3 1 1 2 3
12.17 6.04 6.71 5.75 8.45 5.54 6.46 6.76
Updated May 14, 2013
Comparative metrics summary Stock (Red cells indicate selected stocks for Option 3) Atlantic Halibut Ocean Pout Northern (GOMGB) Windowpane Flounder Southern (SNEMA) Windowpane Flounder Atlantic Wolffish Sum Mean
Juvenile size threshold Age 0 and 1 length (90th percentile, cm) see winter flounder 29
Length at 20% female maturity (cm) (re-estimated by CATT)
Vulnerability of species (Bmsy/B)1
Subpopulations2
Residency3
Substrate4
Final Weighting Sum
28.82 12.05
UNK UNK
2 1
2 2
34.66 16.88
3.48
UNK
2
1
8.31
0.69 3.48
UNK UNK
2 UNK
1 2
5.21
1.83
1.68
1.70
5.52 8.99 208.52 10.43
NA 296
see yellowtail flounder
18
see yellowtail flounder
18
47
477
Spawner hotspot weights
Stock
GB Cod GOM Cod GB Yellowtail Flounder CC/GOM Yellowtail Flounder SNE/MA Yellowtail Flounder GOM Winter Flounder GB Winter Flounder SNE/MA Winter Flounder White Hake GOM Haddock GB Haddock Witch Flounder American Plaice Pollock Acadian Redfish Atlantic Halibut Ocean Pout Northern (GOMGB) Windowpane Flounder Southern (SNEMA) Windowpane Flounder Atlantic Wolffish Sum Mean
Page 4 of 14
Large spawner threshold (20% of total biomass)
Length at 80% female maturity (cm) (reestimated by CATT)
Vulnerability of species (Bmsy/B)1
Subpopulations2
Residency3
Final weighting Sum4
Spring multiplier
Summer multiplier
Fall multiplier
Winter multiplier
75 75
52 52
14.11 5.53
2 3
1 1
17.1 9.5
1 1
1 1
0 0
1 1
40
30
9.39
1
2
12.4
1
0
0
0
40
30
4.21
1
2
7.2
1
0
0
0
40
30
0.77
1
2
3.8
1
0
0
0
45
31
UNK
UNK
2
9.0
1
0
0
1
45
31
1.22
3
2
6.2
1
0
0
1
45
31
6.17
3
2
11.2
1
0
0
1
75 50 50 45 40 75 30 45 60
45 40 40 32 52 25 NA NA
1.21 1.71 0.75 2.45 1.70 0.46 0.76 28.82 12.05
UNK 1 1 3 UNK 2 1 UNK UNK
2 1 1 2 1 2 2 2 1
5.0 3.7 2.7 7.5 4.5 4.5 3.8 32.7 14.9
1 1 1 1 1 0 1 1 0
0 0 0 1 0 0 1 1 1
0 0 0 1 0 0 0 1 1
0 0 0 0 0 1 0 1 1
30
24
3.48
UNK
2
7.3
1
1
1
1
30
24
0.69
UNK
2
4.5
1
1
1
1
45
NA
3.48
UNK
UNK
1 18
0 8
0 5
0 10
5.21
1.83
1.68
7.0 174.5 8.73
Updated May 14, 2013
Comparative metrics summary c. Caveats and future work The spatial distribution of survey effort across the region is far from uniform across space or season. It is not possible to detect hotspots in areas with no survey effort. However, sensitivity analyses indicated that hotspot detection is not sensitive to sampling density, except where tows are so widely spaced that there are very few or no neighboring tows. Datasets that can be used to calculate skate hotspots have been developed, but these hotspots have not been generated. This may be done as part of the analysis for the amendment but is not planned for the immediate future. 4.0
Economic metrics a. Areas evaluated
This analysis compares gears used between new juvenile groundfish areas and new adverse effects habitat areas that are currently open to fishing. b. Methods The goal of this analysis is to summarize net revenue by gear type for various management area proposals. These net revenue estimates represent maximum displaced revenue, as effort could increase in another area to catch the same amount of fish and generate the same amount of net revenue overall. Vessel trip reports are used as the basis for the analysis because they cover all fisheries. However, due to concerns raised by the Groundfish PDT and others about attributing the full revenue from a trip to the single coordinate associated with each VTR, a more sophisticated method for spatially attributing revenues was developed. Models were developed to estimate the likely distribution of fishing effort on a particular trip by comparing tow locations on observed trips with the VTR points associated with those trips. Specifically, distances between the VTR point and observed hauls were used to generate confidence intervals around the VTR points. A separate model was developed for each gear type that included attributes such as trip duration and region (other variables were tested as well but these three had the greatest influence). The confidence intervals were calculated for five percentiles of observed tows: 25, 50, 75, 90, and 95, and are represented spatially as rings around each VTR location. Thus, 25% of the tows occur in the 25th percentile ring, 50% of the tows occur within the 50th percentile ring, and so on. In general, the radius of the rings increased with each successive percentile. The 95th percentile rings had very large radii, so when revenue were attributed to the spatial rings, these largest rings were dropped and the revenues assigned to the 90th percentile ring. Note that the rings are represented as donuts, not as overlapping circles.
Page 5 of 14
Updated May 14, 2013
Comparative metrics summary Revenue for a trip was then attributed proportional to the distribution of tows. VTR points and their associated confidence rings were plotted spatially, and the portions of the confidence rings that overlapped a particular management area were included in the total revenue estimate for that management area. The following figure illustrates the concept. The Cox Ledge habitat management areas are show in black. Two trips are represented by the colored concentric rings. The southwestern trip’s revenue is attributed to a larger area based on the gear type/location/duration model, while revenue from the northeastern trip is attributed over a much smaller area. The 90th percentile confidence ring from the southwestern trip overlaps the management area only slightly, so a small fraction of its revenue is associated with the management area. A greater proportion of the northeastern trip’s four confidence rings overlap the area and therefore a large proportion of the trip’s revenue is associated with Cox Ledge.
c. Caveats and future work Although this approach will allocate some effort to areas in which it does not occur, this is a drawback to all spatial analysis relying on the VTR data. This approach will give a more realistic estimate of revenue distribution as compared to a simple gridding of VTR data. It should be noted that an assumption of the method is that revenue is distributed evenly across tows.
Page 6 of 14
Updated May 14, 2013
Comparative metrics summary Eventually, it should be possible to estimate net revenue (gross revenue less variable trip costs) by management area. These revenues can be disaggregated by factors such as gear type, state, and year. Disaggregation by gear type will be particularly important as fishing restrictions will be applied by gear. As mentioned above, these revenue estimates measure potential displacement of effort. As alternative combinations of area management options are developed, it will be possible to assess the potential for these revenues to be redistributed to other nearby areas. 5.0
Diversity metrics a. Areas evaluated
This analysis compares diversity metrics for current groundfish areas, current habitat areas, new juvenile groundfish areas, and new and modified spawning protection areas. b. Methods Three sets of indices were calculated as follows for the 2002-2012 spring and fall NMFS trawl survey data. The Shannon Diversity Index is a measure of both species richness and the number of individuals of each species in a sample. This index is most sensitive to changes in the number of rare species in a sample. The Simpson Index is most sensitive to changes in the number and abundance of dominant species in a sample. The calculated Simpson indices were inverted so that the index represents the probability that any two individuals drawn from a sample are members of different species. Note that sample size varies considerably between the areas. Shannon index No upper limit on index – maximum value for this data set was 2.944. Larger values indicate greater species diversity. All species caught in the tow, including large mesh groundfish, other regulated species, and other type of fish and invertebrates that are listed individually in the data (e.g. sculpins).
Inverted Simpson index Ranges from 0-1, with indices closer to 1 including more of the listed species in a given tow.
All large mesh groundfish: cod, haddock, yellowtail, redfish, winter flounder, American plaice, windowpane, white hake, pollock, halibut, witch flounder, wolffish
All regulated species: large mesh groundfish plus spiny dogfish, all skates, herring, offshore hake, silver hake, and red hake, summer flounder, mackerel, butterfish, black sea bass, tautog, monkfish, lobster, northern shrimp, sea scallop, shortfin squid, and longfin squid
c. Caveats and future work This analysis will be extended to include the new habitat management areas and DHRAs. Page 7 of 14
Updated May 14, 2013
Comparative metrics summary Figure 1 – Current groundfish management areas
Page 8 of 14
Updated May 14, 2013
Comparative metrics summary Figure 2 – Status quo habitat management areas
Page 9 of 14
Updated May 14, 2013
Comparative metrics summary Figure 3 – New juvenile groundfish habitat areas
Page 10 of 14
Updated May 14, 2013
Comparative metrics summary Figure 4 – New EFH adverse effects minimization habitat management areas
Page 11 of 14
Updated May 14, 2013
Comparative metrics summary Figure 5 – New dedicated habitat research areas
Page 12 of 14
Updated May 14, 2013
Comparative metrics summary Figure 6 – New seasonal spawning groundfish management areas
Page 13 of 14
Updated May 14, 2013
Comparative metrics summary Figure 7 – Modified rolling closure areas. The status quo groundfish management areas are shown for reference.
Page 14 of 14
Updated May 14, 2013
Table 1 – List of areas with existing and potential management measures and area size Area type
Area name
Focus
Season
Gear types restricted
Status Quo Groundfish Management Areas
Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I Nantucket Lightship Jeffreys Bank Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I N Closed Area I S Nantucket Lightship Machias Eastern Maine Toothaker Ridge Jeffreys Bank modified Platts Bank Cashes Ledge modified Ammen Rock Fippennies Ledge Bigelow Bight Jeffreys Ledge Stellwagen Mass Bay Cape Cod Bay Northern Edge Georges Shoal East Georges Shoal West Southern Closed Area II Great South Channel Core + ABCDEF Great South Channel Core + CDEF Great South Channel Core + DEF Cox Ledge Coastal Gulf of Maine 15nm/90m Eastern Maine DHRA Georges Bank DHRA
Various, including spawning protection
Year round
Gear capable of catching groundfish
Adverse effects minimization
Year round
Mobile bottom tending gear
Juvenile groundfish Juvenile groundfish Juvenile groundfish Adverse effects minimization Adverse effects minimization Adverse effects minimization Adverse effects minimization Adverse effects minimization Juvenile groundfish Adverse effects minimization Adverse effects minimization Juvenile groundfish Juvenile groundfish Juvenile groundfish Adverse effects minimization Adverse effects minimization Juvenile groundfish Adverse effects minimization Adverse effects minimization Adverse effects minimization Adverse effects minimization Juvenile groundfish Habitat research Habitat research
Year round
Mobile bottom tending gear
Year round
Under development
Status Quo Habitat Management Areas
New or modified Habitat Management Areas or Juvenile Groundfish Management Areas
DHRAs
Analysis metrics summary tables – Page 15
Square kilometers
Square miles
1377 3030 3951 6916 6263 499 443 2272 1937 584 641 3387 872 1398 700 494 73 324 15 45 2575 733 670 1591 676 171 575 912 1499 3022 2566 2387 213 15715 483 584
532 1170 1525 2670 2418 193 171 877 748 225 248 1308 337 540 270 191 28 125 6 17 994 283 259 614 261 66 222 352 579 1167 991 922 82 6068 186 225
Square nautical miles 402 883 1152 2016 1826 145 129 662 565 170 187 987 254 408 204 144 21 94 4 13 751 214 195 464 197 50 168 266 437 881 748 696 62 4582 141 170
Updated May 14, 2013
Area type
New seasonal spawning areas
Modified seasonal spawning areas
Area name
Focus
Season
Gear types restricted
SERA II DHRA Cashes Ledge Spawner East Cashes 55 Fathom Bunch Cape Elizabeth Boone Island Scantum Jeffreys Ledge Spawner Massachusetts Bay Spawner Wildcat Knoll Scituate Howell Swell Northern Edge Spawner Southeast Part Spawner Southwest Part Vinyard Sound Pout 1 Pout 2 March-April Rolling Closure Mod May Rolling Closure Mod June Rolling Closure Mod CAII Spring Spawner WGOM Spring Spawner
Habitat research Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection Spawning protection
Summer Summer Summer Spring Spring Spring Spring Spring Spring Winter Summer Spring Spring Winter Spring Winter Winter March-April May June Spring Spring
Gear capable of catching groundfish
Gear capable of catching groundfish Gear capable of catching groundfish
Square kilometers
Square miles
1177 4102 1857 400 400 300 400 800 1076 500 200 400 1539 2700 200 564 200 300 8032 6668 3385 6916 3030
Square nautical miles
454 1584 717 154 154 116 154 309 415 193 77 154 594 1042 77 218 77 116 3101 2575 1307 2670 1170
343 1196 541 117 117 87 117 233 314 146 58 117 449 787 58 164 58 87 2342 1944 987 2016 883
Table 2 – List of areas with habitat vulnerability scoring for bottom trawl gear type. Area type
Area name
Status Quo Groundfish Management Areas
Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I Nantucket Lightship Jeffreys Bank
Status Quo
Total Zinf 1186.1 2362.7 4025.3 2556.1 3614.8 510.1
Analysis metrics summary tables – Page 16
100 km^2 grid analysis Total Zinf Vulnerability overlapping per category area 100 km^2 2500.0 47.44 Above average 4800.0 49.22 Above average 8612.4 46.74 Above average 5500.0 46.47 Above average 7800.0 46.34 Above average 900.0 56.68 Very high
Notes Overlap with LISA cluster No Yes Yes No No Yes
Large cobble/boulder polygons skew vulnerability results
Updated May 14, 2013
Area type Habitat Management Areas
New or modified Habitat Management Areas or Juvenile Groundfish Management Areas
DHRAs
Area name Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I N Closed Area I S Nantucket Lightship Machias Eastern Maine Toothaker Ridge Jeffreys Bank modified Platts Bank Cashes Ledge modified Ammen Rock Fippennies Ledge Bigelow Bight Jeffreys Ledge Stellwagen Bank Mass Bay Cape Cod Northern Edge Georges Shoal East Georges Shoal West Southeast Part Great South Channel ABCDEF Great South Channel CDEF Great South Channel DEF Cox Ledge Coastal Juvenile Area Eastern Maine DHRA Georges Bank DHRA SERA II DHRA
Total 588.1 1822.6 735.8 1242.9 609.7 2179.8 157.0 651.6 333.5 688.9 359.1 400.8 61.2 201.2 977.4 802.9 681.9 540.3 109.2 568.2 1053.1 684.1 2162.6 1857.0 1736.4 282.4 609.7 1031.7 499.4
Analysis metrics summary tables – Page 17
-
100 km^2 grid analysis Total Zinf Vulnerability 1200.0 49.01 Above average 3700.0 49.26 Above average 1491.5 49.34 Above average 2700.0 46.03 Below average 1300.0 46.90 Above average 4644.7 46.93 Above average 327.2 47.97 Above average 1266.4 51.45 High 700.0 47.65 Above average 1200.0 57.41 Very high 500.0 71.82 Very high 800.0 50.11 Above average 100.0 61.20 Very high 400.0 50.29 Above average 1908.7 51.21 High 1600.0 50.18 Above average 1400.0 48.71 Above average 1143.2 47.26 Above average 228.8 47.71 Above average 1100.0 51.66 High 2000.0 52.66 High 1500.0 45.61 Below average 4200.0 51.49 High 3600.0 51.58 High 3400.0 51.07 High 600.0 47.06 Above average
Overlap No Yes Yes No No No No Yes Yes Yes Yes No No No Yes Yes Yes No Yes Yes Yes No Yes Yes Yes No
1300.0 2100.0 877.3
Yes No Yes
46.90 49.13 56.92
Above average Above average Very high
Notes
Low data quality Low data quality Large cobble/boulder polygons skew vulnerability results Large cobble/boulder polygons skew vulnerability results
Completely outside model domain
Low data quality Equivalent to CAI S habitat closure
Updated May 14, 2013
Table 3 – List of areas with habitat attributes including data quality and number of grids in the substrate model, depth, and percent of grids with a particular dominant substrate type. Mean data quality
Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I Nantucket Lightship Jeffreys Bank
Number of Voronoi grids 202 964 3007 2697 3695 45
5.2 3.5 6.3 6.5 6.6 5.0
Unstructured (Voronoi) grd analysis Mean Percentage of Voronoi grids identifed as having a depth particular dominant substrate Mud Sand Granule- Cobble Boulder pebble -102.4 19% 38% 3% 20% 19% -90.6 16% 67% 2% 13% 2% -61.4 1% 65% 6% 28% 0% -72.0 1% 76% 3% 20% 0% -61.5 2% 80% 2% 16% 0% -108.9 22% 16% 27% 11% 24%
Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I N Closed Area I S Nantucket Lightship Machias Eastern Maine Toothaker Ridge Jeffreys Bank modified
98 939 1217 676 290 653 62 197 20 45
4.9 3.6 6.8 6.1 6.2 5.1 3.1 2.8 2.0 5.3
-103.6 -87.8 -54.2 -94.6 -61.7 -42.2 -68.4 -89.0 -114.0 -105.7
22% 15% 0% 2% 1% 2% 31% 75% 80% 16%
30% 68% 27% 91% 87% 93% 45% 6% 5% 18%
2% 2% 13% 0% 1% 1% 5% 4% 0% 27%
14% 13% 59% 6% 11% 4% 19% 16% 15% 9%
32% 2% 1% 0% 0% 0% 0% 0% 0% 31%
80
6.2
-77.6
3%
45%
16%
20%
16%
93 28 61 535 190 614 1667
5.1 6.5 6.2 3.0 4.0 3.6 4.1
-99.6 -68.9 -84.3 -93.9 -92.9 -75.9 -48.1
18% 0% 0% 63% 26% 2% 7%
31% 25% 51% 12% 36% 86% 89%
2% 7% 8% 6% 7% 0% 0%
15% 11% 30% 19% 23% 11% 4%
33% 57% 11% 0% 9% 0% 0%
Area type
Area name
Status Quo Groundfish Management Areas Status Quo Habitat Management Areas
New or modified Habitat Management Areas or Juvenile Groundfish Management Areas
Platts Bank Cashes Ledge modified Ammen Rock Fippennies Ledge Bigelow Bight Jeffreys Ledge Stellwagen Bank Mass Bay Cape Cod Northern Edge Georges Shoal East Georges Shoal West Southeast Part Great South Channel
-
145 770 489 414 2018
Analysis metrics summary tables – Page 18
6.6 6.6 5.1 6.0 5.6
-86.6 -29.7 -29.5 -67.3 -47.5
1% 0% 0% 1% 0%
61% 27% 58% 98% 52%
6% 21% 16% 0% 17%
30% 51% 25% 1% 27%
Notes
Large cobble/boulder polygons skew vulnerability results
Low data quality Low data quality Large cobble/boulder polygons skew vulnerability results Large cobble/boulder polygons skew vulnerability results
Non-SASI multibeam data Completely outside model domain
1% 1% 1% 0% 3%
Updated May 14, 2013
Area type
DHRAs
Area name
Unstructured (Voronoi) grd analysis Mean Percentage of Voronoi grids identifed as having a depth particular dominant substrate Mud Sand Granule- Cobble Boulder pebble
Number of Voronoi grids
Mean data quality
1616 1461 61
5.5 5.4 4.8
-27.9 -26.6 -37.6
0% 0% 8%
55% 58% 70%
25% 23% 3%
17% 16% 13%
2% 2% 5%
60 290 703
2.8 6.2 3.5
-84.0 -61.7 -81.7
58% 1% 5%
5% 87% 83%
10% 1% 1%
27% 11% 12%
0% 0% 0%
ABCDEF Great South Channel CDEF Great South Channel DEF Cox Ledge Coastal Juvenile Area Eastern Maine DHRA Georges Bank DHRA SERA II DHRA
Notes
Low data quality Equivalent to CAI S habitat closure Non-SASI multibeam data relied on for substrate assessment
Table 4 - Juvenile groundfish hotspot summary Juvenile hotspots Area type Area name Status Quo Groundfish Management Areas
Status Quo Habitat Management Areas
New or modified
Spring Number Weight
Summer Number Weight
Fall Number Weight
Winter Number Weight
Total Number Weight
Cashes Ledge
1
6.71
16
85.54
12
47.32
4
26.84
33
166.41
Western Gulf of Maine
84
305.38
49
228.72
67
388.81
1
6.71
201
929.62
Closed Area II Closed Area I Nantucket Lightship
11 0
63.25 0.00
39 0
195.50 0.00
16 35
28.75 27.79
0 0
0.00 0.00
66 35
287.50 27.79
16
0.00
79
5.75
1
0.00
4
40.22
100
45.97
Jeffreys Bank Cashes Ledge
7 1
20.28 6.71
39 2
0.00 11.08
22 2
33.80 6.76
0 0
0.00 0.00
68 5
54.08 24.55
70 0
305.38 0.00
32 5
194.92 0.00
56 4
337.17 11.50
1 0
6.71 0.00
159 9
844.18 11.50
0 0
0.00 0.00
0 0
0.00 0.00
10 0
17.04 0.00
0 0
0.00 0.00
10 0
17.04 0.00
10 116 144
0.00 606.66 33.80
54 0 3
0.00 0.00 0.00
0 41 350
0.00 287.85 703.04
2 0 0
40.22 0.00 0.00
66 157 497
40.22 894.51 736.84
Western Gulf of Maine Closed Area II Closed Area I N Closed Area I S Nantucket Lightship Machias Eastern Maine
Analysis metrics summary tables – Page 19
Species
Redfish, plaice, monkfish, haddock, red hake, silver hake Redfish, plaice, cod, monkfish, haddock, red hake, silver hake, white hake, winter flounder, witch flounder Haddock, red hake, windowpane, winter flounder Plaice, haddock, red hake, silver hake Cod, monkfish, haddock, red hake, silver hake, windowpane Redfish, red hake, silver hake, white hake, witch Redfish, plaice, haddock, silver hake Redfish, plaice, cod, monkfish, haddock, red hake, silver hake, white hake, winter flounder, witch flounder Haddock, red hake, winter flounder Plaice, haddock, red hake No juvenile hotspots Cod, monkfish, red hake, silver hake Cod, haddock, halibut Redfish, alewife, silver hake, white hake,
Updated May 14, 2013
Juvenile hotspots Area type Area name Habitat Management or Juvenile Groundfish Management Areas
DHRAs
Spring Number Weight
Summer Number Weight
Fall Number Weight
Winter Number Weight
Total Number Weight
Species
windowpane, winter flounder, witch flounder Toothaker Ridge Jeffreys Bank modified Platts Bank Cashes Ledge modified Ammen Rock Fippennies Ledge
43
81.12
33
0.00
69
128.44
0
0.00
145
209.56
0 0
0.00 0.00
5 0
0.00 0.00
15 1
27.04 6.76
0 0
0.00 0.00
20 1
27.04 6.76
Redfish, pollock, silver hake, white hake Redfish
1 0
6.71 0.00
2 1
11.08 5.54
2 0
6.76 0.00
0 0
0.00 0.00
5 1
24.55 5.54
Redfish, plaice, haddock, silver hake Plaice
0
0.00
0
0.00
0
0.00
2
13.42
2
13.42
Bigelow Bight Jeffreys Ledge Stellwagen Bank
696 26
2911.17 133.38
106 5
503.08 32.58
659 28
2217.26 152.18
0 0
0.00 0.00
1461 59
5631.51 318.14
5
38.58
1
5.54
9
82.93
0
0.00
15
127.05
Mass Bay
125
1006.64
6
33.24
134
457.55
104
664.09
369
2161.52
Cape Cod Northern Edge Georges Shoal East Georges Shoal West Southeast Part Great South Channel ABCDEF Great South Channel CDEF Great South Channel DEF Cox Ledge Coastal juvenile area Eastern Maine DHRA Georges Bank DHRA
125 0
801.92 0.00
0 0
0.00 0.00
88 6
0.00 28.75
0 0
0.00 0.00
213 6
801.92 28.75
Haddock Redfish, alewife, plaice, cod, monkfish, haddock, pout, pollock, red hake, silver hake, white hake, winter flounder, witch flounder, yellowtail flounder Redfish, plaice, monkfish, silver hake Redfish, plaice, cod, white hake, winter flounder Plaice, herring, cod, pollock, silver hake, white hake, winter flounder, yellowtail Cod, red hake, silver hake, white hake, windowpane, winter flounder, yellowtail Haddock, red hake
0
0.00
9
0.00
7
0.00
0
0.00
16
0.00
Red hake, windowpane, winter flounder
0 5
0.00 28.75
0 31
0.00 178.25
2 0
0.00 0.00
0 0
0.00 0.00
2 36
0.00 207.00
0
0.00
0
0.00
6
0.00
0
0.00
6
0.00
Winter flounder
0
0.00
0
0.00
6
0.00
0
0.00
6
0.00
Winter flounder
0 0
0.00 0.00
0 0
0.00 0.00
5 0
0.00 0.00
0 0
0.00 0.00
5 0
0.00 0.00
Winter flounder No juvenile hotspots
1523
5121.54
47
220.28
1659
3164.37
112
588.91
3341
9095.10
41
0.00
0
0.00
110
229.84
0
0.00
151
229.84
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
Analysis metrics summary tables – Page 20
Redfish, witch
Red hake Haddock, yellowtail
All species Redfish, silver hake, white hake, windowpane, winter flounder, witch No juvenile hotspots
Updated May 14, 2013
Juvenile hotspots Area type Area name
New seasonal spawning areas
Modified seasonal spawning areas
Spring Number Weight
Summer Number Weight
Fall Number Weight
Winter Number Weight
Total Number Weight
Species
SERA II DHRA Cashes Ledge Spawner East Cashes 55 Fathom Bunch
24
112.94
6
28.92
17
123.49
1
6.71
48
272.06
Redfish, plaice, cod, haddock, red hake, silver hake, white hake, winter flounder
6 4
6.71 0.00
22 5
100.28 13.52
31 12
60.84 6.76
0 0
0.00 0.00
59 21
167.83 20.28
Redfish, witch Redfish, witch
0
0.00
4
27.04
2
6.76
0
0.00
6
33.80
Cape Elizabeth
149
459.95
7
19.06
168
447.12
6
0.00
330
926.13
Boone Island
114
485.86
4
25.82
118
429.71
0
0.00
236
941.39
Scantum Jeffreys Ledge Spawner Mass Bay Spawner Wildcat Knoll
78
409.87
26
90.42
67
245.90
1
0.00
172
746.19
35
153.86
14
35.68
29
149.08
1
6.71
79
345.33
125 10
612.59 125.30
12 0
66.48 0.00
94 10
241.38 100.24
15 11
87.71 75.18
246 31
1008.16 300.72
36 0
176.61 0.00
0 0
0.00 0.00
3 0
0.00 0.00
0 0
0.00 0.00
39 0
176.61 0.00
0
0.00
14
0.00
19
40.25
0
0.00
33
40.25
9
51.75
15
86.25
3
0.00
0
0.00
27
138.00
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
Scituate Howell Swell Northern Edge Spawner Southeast Part Spawner Southwest Part Vineyard Sound Ocean Pout 1 Ocean Pout 2 March April Modified Rolling
58 0 0
0.00 0.00 0.00
0 0 0
0.00 0.00 0.00
1 0 0
0.00 0.00 0.00
0 6 4
0.00 0.00 0.00
59 6 4
0.00 0.00 0.00
646
3192.18
159
728.90
662
2045.54
131
720.92
1598
6687.54
May Modified Rolling
844
3545.78
209
970.48
737
2520.43
23
31.77
1813
7068.46
June Modified Rolling
456
1672.84
63
313.60
447
1451.93
2
0.00
968
3438.37
Analysis metrics summary tables – Page 21
Redfish, witch Redfish, alewife, plaice, monkfish, haddock, pollock, red hake, silver hake, white hake, witch Redfish, plaice, monkfish, haddock, pout, red hake, silver hake, witch Redfish, plaice, cod, haddock, ocean pout, pollock, red hake, silver hake, white hake, witch Redfish, plaice, haddock, red hake, silver hake Redfish, plaice, cod, red hake, white hake, windowpane, winter flounder, yellowtail Cod, winter flounder Plaice, cod, monkfish, red hake, white hake, winter flounder Redfish, witch Haddock, red hake, windowpane, winter flounder Haddock, red hake No juvenile hotspots Red hake, silver hake, windowpane, winter flounder Winter flounder Silver hake Redfish, plaice, cod, haddock, pout, pollock, red hake, silver make, white hake, winter flounder, witch, yellowtail Redfish, alewife, plaice, herring, cod, monkfish, haddock, pout, pollock, red hake, silver hake, white hake, winter flounder, witch, yellowtail Redfish, alewife, plaice, cod, monkfish, haddock, pout, pollock, red hake, silver hake, white hake, winter flounder, witch
Updated May 14, 2013
Juvenile hotspots Area type Area name
Spring Number Weight
Summer Number Weight
Fall Number Weight
Winter Number Weight
Total Number Weight
Species
flounder
CA2 Spring Spawner
11
63.25
39
195.50
16
28.75
1
6.71
67
294.21
WGoM Spring Spawner
97
549.75
24
0.00
42
22.44
3
0.00
166
572.19
Haddock Redfish, plaice, cod, monkfish, haddock, red hake, silver hake, white hake, witch flounder
Table 5 - Spawner hotspot summary Spawner hotspot Area type Area name Status Quo Cashes Ledge Groundfish Management Western Gulf Areas of Maine
Status Quo Habitat Management Areas
New or modified Habitat Management or Juvenile Groundfish Management Areas
Spring Number Weight 7 15.04
Summer Number Weight 3 11.28
Fall Number Weight 11 14.90
Winter Number Weight 0 0.00
Total Number Weight 21 41.22
Species Redfish, red hake, witch Alewife, plaice, cod, haddock, pollock, red hake, silver hake, white hake, witch, yellowtail Cod, haddock, red hake, windowpane, winter flounder, yellowtail Redfish, alewife, plaice, haddock, pout, red hake, silver hake, winter flounder, yellowtail
104
391.40
30
0.00
82
0.00
19
28.50
235
419.90
Closed Area II
97
549.75
24
0.00
42
22.44
3
0.00
166
572.19
Closed Area I Nantucket Lightship Jeffreys Bank Cashes Ledge
2
6.46
15
0.00
23
15.05
0
0.00
40
21.51
0 0 0
0.00 0.00 0.00
2 0 2
0.00 0.00 7.52
0 0 2
0.00 0.00 7.45
6 0 0
28.14 0.00 0.00
8 0 4
28.14 0.00 14.97
79 5
341.60 13.50
12 0
0.00 0.00
61 0
0.00 0.00
19 0
28.50 0.00
171 5
370.10 13.50
1
3.76
1
0.00
16
0.00
0
0.00
18
3.76
Redfish, plaice, herring, haddock, red hake
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
No hotspots
0 0
0.00 0.00
0 0
0.00 0.00
0 2
0.00 0.00
0 0
0.00 0.00
0 2
0.00 0.00
No hotspots Cod
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
No spawner hotspots
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
Redfish, witch
0 1 0
0.00 0.00 0.00
1 0 2
7.45 0.00 7.52
0 1 2
0.00 0.00 7.45
0 0 0
0.00 0.00 0.00
1 2 4
7.45 0.00 14.97
Western Gulf of Maine Closed Area II Closed Area I N Closed Area I S Nantucket Lightship Machias Eastern Maine Toothaker Ridge Jeffreys Bank modified Platts Bank Cashes Ledge
Analysis metrics summary tables – Page 22
cod, haddock, windowpane Witch Redfish, red hake, witch Plaice, herring, cod, haddock, pollock, red hake, silver hake, white hake, witch, yellowtail Haddock
Witch Red hake, silver hake Redfish, red hake, witch
Updated May 14, 2013
Spawner hotspot Area type Area name modified Ammen Rock Fippennies Ledge
DHRAs
New seasonal spawning areas
Spring Number Weight
Summer Number Weight
Number
Fall Weight
Winter Number Weight
Total Number Weight
Species
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
No spawner hotspots
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
Bigelow Bight Jeffreys Ledge Stellwagen Bank
226
304.50
38
0.00
186
0.00
0
0.00
450
304.50
23
66.70
3
0.00
33
0.00
9
28.50
68
95.20
20
128.30
2
0.00
8
0.00
3
0.00
33
128.30
Mass Bay Cape Cod Northern Edge Georges Shoal East Georges Shoal West Southeast Part Great South Channel ABCDEF Great South Channel CDEF Great South Channel DEF Cox Ledge
37 2
177.05 0.00
5 0
0.00 0.00
40 5
0.00 0.00
3 0
28.50 0.00
85 7
205.55 0.00
No spawner hotspots Redfish, alewife, plaice, halibut, dod, haddock, pollock, red hake, silver hake, yellowtail Plaice, cod, haddock, pollock, red hake, silver hake, white hake, yellowtail Plaice, cod, haddock, pollock, red hake, white hake, witch Plaice, halibut, cod, haddock, pout, red hake, silver hake Pout, red hake, silver hake
2
19.80
0
0.00
11
0.00
0
0.00
13
19.80
6
30.60
2
0.00
4
22.44
0
0.00
12
53.04
Halibut, cod, haddock, red hake Herring, cod, haddock, windowpane, winter flounder
0
0.00
0
0.00
3
22.44
0
0.00
3
22.44
Windowpane
28
182.19
0
0.00
11
0.00
0
0.00
39
182.19
6
14.10
0
0.00
0
0.00
0
0.00
6
14.10
Plaice, herring
6
14.10
0
0.00
0
0.00
0
0.00
6
14.10
Plaice, herring
6 0
14.10 0.00
0 0
0.00 0.00
0 0
0.00 0.00
0 0
0.00 0.00
6 0
14.10 0.00
339
674.81
19
0.00
288
37.31
9
46.63
655
758.75
Plaice, herring No spawner hotspots Redfish, alewife, plaice, herring, cod, haddock, pout, pollock, red hake, silver hake, windowpane, witch, yellowtail
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
No spawner hotspots
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
46
256.10
19
0.00
6
0.00
10
0.00
81
256.10
No spawner hotspots Plaice, cod, haddock, pollock, red hake, silver hake, white hake, witch
23 12
41.36 26.32
53 33
206.52 127.70
20 4
14.90 0.00
0 0
0.00 0.00
96 49
262.78 154.02
Redfish, witch Redfish, witch
1
0.00
14
52.64
2
0.00
0
0.00
17
52.64
Redfish, witch
Coastal juvenile Eastern Maine DHRA Georges Bank DHRA SERA II DHRA Cashes Ledge Spawner East Cashes 55 Fathom Bunch
Analysis metrics summary tables – Page 23
Haddock, yellowtail
Updated May 14, 2013
Spawner hotspot Area type Area name Cape Elizabeth
Modified seasonal spawning areas
Spring Number Weight
Summer Number Weight
Number
Fall Weight
Winter Number Weight
Total Number Weight
Species Redfish, alewife, plaice, herring, red hake, silver hake Redfish, plaice, herring, red hake, silver hake, yellowtail Redfish, plaice, herring, cod, red hake, silver hake, yellowtail
72
89.30
1
0.00
42
0.00
0
0.00
115
89.30
Boone Island
41
75.20
1
0.00
41
0.00
0
0.00
83
75.20
Scantum Jeffreys Ledge Spawner Mass Bay Spawner
28
99.00
9
0.00
36
0.00
0
0.00
73
99.00
47
213.60
7
0.00
34
0.00
12
28.50
100
242.10
77
419.10
0
0.00
24
14.96
0
0.00
101
434.06
Wildcat Knoll
19
117.80
0
0.00
9
0.00
0
0.00
28
117.80
Scituate Howell Swell Northern Edge Spawner Southeast Part Spawner Southwest Part Vineyard Sound Ocean Pout 1 Ocean Pout 2 March April Modified Rolling May Modified Rolling June Modified Rolling CA2 Spring Spawner WGoM Spring Spawner
6 0
4.70 0.00
0 13
0.00 48.88
18 1
0.00 0.00
3 0
28.50 0.00
27 14
33.20 48.88
16
75.52
2
0.00
16
22.44
0
0.00
34
97.96
66
415.54
18
0.00
21
0.00
2
0.00
107
415.54
0
0.00
0
0.00
0
0.00
4
37.58
4
37.58
37 0 0
149.65 0.00 0.00
0 0 0
0.00 0.00 0.00
0 4 1
0.00 0.00 4.69
0 6 5
0.00 90.30 75.25
37 10 6
149.65 90.30 79.94
287
999.21
68
0.00
311
37.31
28
74.84
694
1111.36
348
879.94
83
9.50
306
37.31
23
46.34
760
973.09
172
212.32
29
9.50
124
0.00
0
0.00
325
221.82
84
305.38
49
228.72
67
388.81
1
6.71
201
929.62
Redfish, alewife, plaice, herring, red hake, silver hake, yellowtail Cod, haddock, windowpane, winter flounder
104
391.40
30
0.00
82
0.00
19
28.50
235
419.90
Plaice, herring, cod, haddock, pollock, red hake, silver hake, witch, yellowtail
Analysis metrics summary tables – Page 24
Plaice, cod, haddock, pollock, red hake, silver hake, white hake, yellowtail Redfish, plaice, herring, cod, haddock, red hake, silver hake, windowpane, yellowtail Plaice, cod, haddock, red hake, witch, yellowtail Plaice, herring, cod, red hake, silver hake, yellowtail Redfish, witch Herring, cod, haddock, red hake, windowpane, winter flounder Haddock, windowpane, winter flounder, yellowtail Ocean pout, windowpane, yellowtail Red hake, silver hake, windowpane, winter flounder Pout, yellowtail Pout, windowpane Redfish, plaice, herring, cod, haddock, pout, pollock, red hake, silver hake, windowpane, witch, yellowtail Redfish, plaice, herring, cod, haddock, pollock, red hake, silver hake, windowpane, yellowtail
Updated May 14, 2013
Table 6 – Gears used in area in rank order of total revenue for calendar year 2012. Hydraulic clam dredge gears not listed.
Revenue Area type New or modified Habitat Management or Juvenile Groundfish Management Areas
Area name Machias Eastern Maine Toothaker Ridge Jeffreys Bank modified Platts Bank Cashes Ledge modified Ammen Rock Fippennies Ledge Bigelow Bight Jeffreys Ledge Stellwagen Bank Mass Bay Cape Cod Northern Edge Georges Shoal East Georges Shoal West Southeast Part Great South Channel ABCDEF Great South Channel CDEF Great South Channel DEF Cox Ledge
Analysis metrics summary tables – Page 25
Major gears used, in rank order of total revenue, calendar year 2012 Pot/trap, scallop dredge Pot/trap, purse seine, midwater trawl, bottom trawl, longline Pot/trap, purse seine, midwater trawl, bottom trawl Purse seine, pot/trap, bottom trawl, midwater trawl Not analyzed yet Not analyzed yet - closed to many types of fishing currently Not analyzed yet - closed to many types of fishing currently Not analyzed yet - closed to many types of fishing currently Pot/trap. Bottom trawl, sink gillnet, purse seine, midwater trawl, longline Not analyzed yet - closed to many types of fishing currently Not analyzed yet - closed to many types of fishing currently Not analyzed yet Pot/trap, scallop dredge, bottom trawl, longline, midwater trawl, gillnet Not analyzed yet - closed to many types of fishing currently Scallop dredge, bottom trawl, SAP trawl, pot/trap, longline Otter trawl, scallop dredge, midwater trawl, pot/trap, SAP trawl Not analyzed yet - closed to many types of fishing currently Scallop dredge, sink gillnet, pot/trap, bottom trawl, midwater trawl, longline, harpoon Only largest GSC area evaluated thus far Only largest GSC area evaluated thus far Sink gillnet, bottom trawl, pot/trap, scallop dredge, midwater trawl
Updated May 14, 2013
Table 7 – Diversity indices
Diversity indices Area type
Area
Status Quo Groundfish Management Areas
Cashes Ledge Western Gulf of Maine Closed Area I Closed Area II Nantucket Lightship Jeffreys Bank Cashes Ledge Western Gulf of Maine Closed Area II Closed Area I N Closed Area I S Nantucket Lightship Machias Eastern Maine Toothaker Ridge Jeffreys Bank modified Platts Bank Cashes Ledge modified Ammen Rock Fippennies Ledge Bigelow Bight Jeffreys Ledge Stellwagen Mass Bay Cape Cod Northern Edge Georges Shoal East Georges Shoal West Southeast Part Great South Channel ABCDEF Great South Channel CDEF
Status Quo Habitat Management Areas
New or modified Habitat Management Areas or Juvenile Groundfish Management Areas
Analysis metrics summary tables – Page 26
Number of tows 60 285 403 645 703 71 19 239 132 166 40 296 2 90 25
Shannon Diversity Index All species Mean StDev 1.278 1.352 1.139 1.099 1.092 1.434 1.227 1.297 0.708 1.098 1.395 1.120 1.313 1.649 1.515
0.577 0.542 0.541 0.585 0.641 0.400 0.625 0.542 0.610 0.574 0.467 0.645 0.157 0.452 0.467
Inverted Simpson Diversity Index Large mesh groundfish Regulated groundfish Mean StDev Mean StDev 0.71 0.747 0.981 0.937 0.869 0.827 0.679 0.718 0.957 0.966 0.994 0.859 0.935 0.888 0.971
0.342 0.271 0.075 0.153 0.307 0.184 0.372 0.278 0.145 0.107 0.017 0.317 0.043 0.163 0.072
0.622 0.663 0.576 0.576 0.63 0.726 0.605 0.639 0.358 0.555 0.714 0.694 0.692 0.758 0.860
0.308 0.252 0.291 0.31 0.342 0.199 0.339 0.256 0.328 0.302 0.235 0.332 0.013 0.193 0.225
0.222
0.697
0.214
0.249 0.244 0.174
0.632 0.695 0.340
0.226 0.262 0.319
0.143
0.656
0.266
not yet analyzed
262
1.45
0.448
0.809 not yet analyzed
313 227 39
1.317 1.491 0.678
0.532 0.585 0.585
0.699 0.854 0.926 not yet analyzed
182
1.211
0.506
0.944 not yet analyzed
Updated May 14, 2013
Diversity indices Area type
DHRAs
New seasonal spawning areas
Modified seasonal spawning areas
Area Great South Channel DEF Cox Ledge Coastal Juvenile Area Eastern Maine DHRA Georges Bank DHRA SERA II DHRA Cashes Ledge East Cashes 55 Fathom Bunch Cape Elizabeth Boone Island Scantum Jeffreys Ledge Spawner Mass Bay Spawner Wildcat Knoll Scituate Howell Swell Northern Edge Spawner Southeast Part Spawner Southwest Part Vineyard Sound Ocean Pout 1 Ocean Pout 2 March April Modified Rolling May Modified Rolling June Modified Rolling CA2 Spring Spawner WGoM Spring Spawner
Analysis metrics summary tables – Page 27
Number of tows
1394
Shannon Diversity Index All species Mean StDev
1.517
0.532
Inverted Simpson Diversity Index Large mesh groundfish Regulated groundfish Mean StDev Mean StDev
0.82
0.224
0.707
0.224
0.213
0.749
0.227
0.160 0.202 0.130 0.232 0.248 0.206 0.239 0.310 0.127 0.128 0.175 0.049 0.108 0.362 0.265 0.233 0.238 0.233 0.153 0.271
0.759 0.673 0.777 0.632 0.661 0.676 0.675 0.627 0.824 0.425 0.659 0.885 0.805 0.663 0.714 0.698 0.693 0.707 0.576 0.663
0.164 0.171 0.197 0.205 0.228 0.189 0.207 0.287 0.140 0.342 0.260 0.137 0.211 0.335 0.276 0.222 0.226 0.226 0.310 0.252
not yet analyzed 214
1.484
0.436
4 52 15 60 104 228 48 80 24 211 270 11 177 39 42 1,310 878 201 645 285
1.450 1.500 1.571 1.285 1.377 1.518 1.451 1.292 1.661 0.814 1.281 1.345 1.369 1.347 1.279 1.469 1.440 1.448 1.099 1.352
0.207 0.391 0.386 0.364 0.493 0.436 0.551 0.674 0.279 0.631 0.514 0.700 0.603 0.770 0.663 0.520 0.493 0.477 0.585 0.542
0.851 not yet analyzed 0.799 0.781 0.92 0.686 0.734 0.735 0.741 0.717 0.903 0.960 0.916 0.983 0.971 0.753 0.887 0.777 0.782 0.827 0.937 0.747
Updated May 14, 2013
