doc7 2011 Scallop Surveys - NEFMCarchive.nefmc.org/scallops/cte_mtg_docs/120119/doc7 2011 Scallop...

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Summary of 2011 Sea Scallop Surveys January 5, 2011 PDT Meeting SMAST Video (Cate O’Keefe) VIMS Dredge (David Rudders) HabCam (Scott Gallagher) NEFSC Dredge (Dvora Hart) 1

Transcript of doc7 2011 Scallop Surveys - NEFMCarchive.nefmc.org/scallops/cte_mtg_docs/120119/doc7 2011 Scallop...

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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

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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

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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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