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Results from the 2004 cooperative survey of Atlantic surfclams
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2005
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[PDF-2.28 MB]
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Description:A cooperative survey of the Atlantic surfclam EEZ resource was successfully carried out in 2004. The survey area included the Mid-Atlantic coast from the Hudson Canyon, off northern New Jersey (NNJ), to southern Virginia (SVA). Fieldwork was conducted from the FV Lisa Kim, a commercial clamming vessel. A stratified random sampling design was used, and dredge efficiency was measured with depletion experiments. The survey covered the full depth range of the species, to 50 m. Of the four regions surveyed in 2004, the greatest biomass was in NNJ. Fully recruited biomass in NNJ has remained fairly stable from 1997 - 2004 at about 500,000 mt. The region with second highest biomass in 2004 was Delmarva (DMV), with approximately 143,000 mt. There was a large decline in the resource in this region between 1999 and 2002. No change in biomass in DMV was detected from 2002 to 2004. Neither Southern New Jersey (SNJ) nor SVA had significant biomass (<20,000 mt combined) in 2004, and biomass appears to have declined in those regions since 2002. Fully-recruited surfclam biomass is more concentrated in the NNJ region than in the past. Most of the NNJ resource is located in deeper water now. At the large regional scale, the fully recruited clams in NNJ have increased in shell size over time. Strong recruitment occurred recently in the two NNJ mid-depth strata, but not in shallower strata of NNJ or DMV.
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Content Notes:by James R. Weinberg, Eric N. Powell, Chris Pickett, Victor A. Nordahl, Jr., and Larry D. Jacobson
"February 2005."
"Web version posted February 10, 2005."
Includes bibliographical references (page 9).
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Rights Information:Public Domain
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