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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on October 4, 2007
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsm147
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Correcting for effective area fished in fishery-dependent depletion estimates of abundance and capture efficiency

John F. Walter, III, John M. Hoenig and Todd Gedamke

College of William and Mary, PO Box 1364, Gloucester Point, VA 23062, USA

Correspondence to J. F. Walter III: Present address: National Oceanic and Atmospheric Administration, Southeast Fisheries Science Center, 75 Virginia Beach Drive, Miami, FL 33149, USA; tel: +1 305 3654114; fax: +1 305 3654104; e-mail: john.f.walter{at}noaa.gov

Walter, J. F. III, Hoenig, J. M., and Gedamke, T. 2007. Correcting for effective area fished in fishery-dependent depletion estimates of abundance and capture efficiency. – ICES Journal of Marine Science 64: 000–000.

Depletion methods are widely used to estimate capture efficiency and abundance. However, they are highly dependent on the depletion area assumed. In open-ocean depletion studies, it is difficult to determine the true area of depletion. Satellite vessel monitoring systems (VMS) offer the potential to determine the area effectively fished. Observer-collected catch-and-effort data from the 1999 Atlantic sea scallop fishery in Georges Bank Closed Area II were used to obtain spatially-explicit DeLury depletion estimates of dredge efficiency and abundance, with corrections for fished area made using VMS data. Non-area-corrected efficiency estimates often had theoretically impossible values, indicating that the naïvely assumed fished area was likely too big. Fine-scale spatial analyses on individual depletion cells confirmed this result. Corrected-area efficiency estimates exhibited reduced variability and more plausible efficiencies, with 70% of 289 individual depletion estimates falling between 20% and 55%, with a mean of 46%. Abundance estimates from individual depletion studies matched maps of abundance from a preseason survey. Results indicated a total abundance of ~17 million pounds of scallop meat weight in the fished area, of which 6 million pounds were landed, providing an overall exploitation rate of 35%.

Keywords: DeLury depletion, gear efficiency, kriging, Placopecten magellanicus, scallops, vessel monitoring systems

Received 18 December 2006; accepted 26 July 2007.


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