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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on September 18, 2007
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsm136
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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

Gillnet mesh selectivity of the sandbar shark (Carcharhinus plumbeus): implications for fisheries management

R. B. McAuley1,2,, C. A. Simpfendorfer3 and I. W. Wright1

1 Department of Fisheries, Government of Western Australia, WA Fisheries and Marine Research Laboratories, PO Box 20, North Beach, WA 6920, Australia
2 Centre for Ecosystem Management, School of Natural Sciences, Edith Cowan University, 100 Joondalup Drive, Joondalup, WA 6027, Australia
3 School of Earth and Environmental Sciences, James Cook University, Townsville, QLD 4811, Australia

Correspondence to R. B. McAuley: tel: +61 8 9203 0210; fax: +61 8 9203 0111; e-mail: rmcauley{at}fish.wa.gov.au

McAuley, R. B., Simpfendorfer, C. A., and Wright, I. W. 2007. Gillnet mesh selectivity of the sandbar shark (Carcharhinus plumbeus): implications for fisheries management. – ICES Journal of Marine Science, 64.

Gillnet mesh selectivity parameters for the sandbar shark (Carcharhinus plumbeus) were estimated from catches taken by an experimental net of six panels of mesh, varying in size from 10.2 to 25.4 cm. The length selectivity of each mesh size was described by five different models. According to model deviance values, the four models based on the SELECT method of estimation provided better fits to the data than the gamma model previously applied to sharks. Lengths at maximum selectivity were estimated to be between 5.3 and 7.0xstretched mesh size. The breadth of the selectivity curves was greater than have been reported for most species of shark. Lognormal and normal curve forms yielded the lowest model deviance and were judged to provide the best fits to the data. Peak selectivity of the commercially utilized mesh sizes was generally estimated to be greater than the observed modal length class of the commercial C. plumbeus catch. This suggests that a relatively high abundance of smaller sharks in the study area offsets gear selectivity effects in determining the size composition of commercial catches. These results have important implications for the recovery of this overexploited stock and also for managing international gillnet fisheries for the species.

Keywords: Carcharhinus plumbeus, gillnet, mesh selectivity, SELECT, shark

Received 12 April 2006; accepted 29 July 2007.


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