Prosomal-width-to-weight relationships in American horseshoe crabs (Limulus polyphemus): examining conversion factors used to estimate landings

Graham, Larissa J. and Botton, Mark L. and Hata, David and Loveland, Robert E. and Murphy, Brian R. (2009) Prosomal-width-to-weight relationships in American horseshoe crabs (Limulus polyphemus): examining conversion factors used to estimate landings. Fishery Bulletin, 107(2), pp. 235-243.

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Abstract

Horseshoe crabs (Limulus polyphemus) are valued by many stakeholders, including the commercial fishing industry, biomedical companies, and environmental interest groups. We designed a study to test the accuracy of the conversion factors that were used by NOAA Fisheries and state agencies to estimate horseshoe crab landings before mandatory reporting that began in 1998. Our results indicate that the NOAA Fisheries conversion factor consistently overestimates the weight of male horseshoe crabs, particularly those from New England populations. Because of the inaccuracy of this and other conversion factors, states are now mandated to report the number (not biomass) and sex of landed horseshoe crabs. However, accurate estimates of biomass are still necessary for use in prediction models that are being developed to better manage the horseshoe crab fishery. We recommend that managers use the conversion factors presented in this study to convert current landing data from numbers to biomass of harvested horseshoe crabs for future assessments.

Item Type: Article
Title: Prosomal-width-to-weight relationships in American horseshoe crabs (Limulus polyphemus): examining conversion factors used to estimate landings
Personal Creator/Author:
CreatorsEmail
Graham, Larissa J.
Botton, Mark L.
Hata, David
Loveland, Robert E.
Murphy, Brian R.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 107
Number: 2
Page Range: pp. 235-243
Date: 2009
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8805
Depositing User: Patti M. Marraro
Date Deposited: 11 Jun 2012 18:28
Last Modified: 11 Jun 2012 18:28
URI: http://aquaticcommons.org/id/eprint/8805

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