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Summary of 2011 Sea Scallop SurveysJanuary 5, 2011 PDT Meeting
SMAST Video (Cate O’Keefe)VIMS Dredge (David Rudders)HabCam (Scott Gallagher)NEFSC Dredge (Dvora Hart)
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2011 Sea scallop surveys
SMAST: 2,700 stations in May‐JulyGB and MA plus expanded west of HC and east of LI
VIMS: CA2, Delmarva, Similar expanded area west of HC and east of LI
Habcam: CA1
NEFSC: 3 Legs: 1‐GB; 2‐MA; 3‐GB Habcam2
SMAST: Total Sea Scallop Meat Weight by Area (million lbs)
Year Georges Bank Mid Atlantic Total2010 189.6 132.3 321.920112011 (new)
192.0 130.5157.0
322.5349.0
** 27 million lbs outside of original SMAST survey footprint
** 23 million lbs “outside” NMFS survey strata(Some of that biomass is now being captured by NEFSC survey since
it was expanded west 10 years ago, but not waters east of LI)3
SMAST Mid‐Atlantic Survey Expansion
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2011 VIMS‐Industry Cooperative Surveys4 trips: CA2, Del, SNE, NY Bight (May‐Oct)
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This dredge survey able to provide additional information on gear performance, scallop biology and product quality and bycatch.
Overall biomass was high and small amounts of recruitment. Similar results with SMAST.
Closed Area II‐ Recruited scallop abundance was widespread and density was relatively high. Very little recruitment in the area.
DelMarVa‐ Recruited scallop abundance was very low, although some signs of recruitment. May be difficult to get the scheduled ½ trip in 2012.
Southern New England/Long Island‐ Recruited scallop abundance was widespread and density was relatively high. Some recruitment observed esp. to West.
New York Bight‐ Recruited scallop abundance was widespread and density was relatively low. Resource is very patchy. Some recruitment observed.
Surveys helped delineate the inshore extent of the scallop resource from Cape May to Martha’ Vineyard and the above average SH:MW relationships for those areas.
2011 VIMS‐Industry Cooperative SurveysSummary
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2011 Habcam Survey TracksIntensive CLAI Survey
5 days sampling effortTotal images: 2,039,157Images Available: 1,427,385Processed by ~1/1020 man days to process
Area Sampled: 90,800 m2
Area CLAI (2+3): 1,400,070,000 m2
Percent Sampled: 0.007%
NOAA10 sampling stations1,800 m2 /towArea Sampled: 18,000 m2
Percent sampled: 0.001 %
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(#/m2)
Scallop Density (#/m2) Large Exploitable Scallops grid cell size 892x888 m
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NEFSC Dredge survey
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NEFSC Recruitment
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Scallop biomass from NEFSC dredge survey
1980 1985 1990 1995 2000 2005 2010
020
0040
0060
0080
00
Year
Mea
n bi
omas
s (g
mea
ts/to
w)
1980 1985 1990 1995 2000 2005 2010
Year
020
0040
0060
0080
00
Mea
n bi
omas
s (g
mea
ts/to
w)
Georges Bank
Mid‐Atlantic
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Numbers in millions
Area NEFSC SMAST VIMS
Dredge Video Sv Dredge
Georges Bank
Open 1451 1937 N/S
CLIAcc 317 331 N/S
CLINA 586 598 N/S
CLIIAcc 798 692 773
CLIINA 371 451 N/S
NLSAcc 153 105 N/S
NLSNA 2 54 N/S
TOTAL GB 3678 4168 N/S
Mid‐Atlantic
Open 1539 1324 N/S
HCS 770 787 N/S
Dmv 246 270 138
TOTAL MA 2554 2382 N/S
OVERALL TOTAL 6232 6549
Comparison of survey estimates
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Preliminary Biomass EstimatesArea NEFSC SMAST
VIMS (exploitable only) Habcam
CL1‐Acc 32.7 27.7 39.9
CL1‐NA 13.4 13.9
CL2‐Acc 33.6 28.3 37.3
CL2‐NA 22.5 36
NLS‐Acc 8.7 7.3
NLS‐NA 0.2 6.2
NEP 17.7 10.4
SCH 37.6 58.4
SEP 8.4 4.9
GB Total 174.9 192
DMV 7.2 13.1 3.7
HCS 36.2 42.6
ET 4.5
NYB 23.4 24.8
LI 43.2 50.2
VB 0.1
MA Total 114.6 157
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Future of NEFSC survey
Next generation stereo Habcam system to be deployed starting in 2012
Dredge survey will continue but at lower station density
Habcam and dredge will be likely deployed sequentially on all survey legs
Automated processing of imaging progressing –hope to be ready by 2012 survey
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