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

McAuley, R.B., Simpfendorfer, C.A., and Wright, I.W. (2007) Gillnet mesh selectivity of the sandbar shark (Carcharhinus plumbeus): implications of fisheries management. ICES Journal of Marine Science, 64 (9). pp. 1702-1709.

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Abstract

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 7.0 x stretched 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.

Item ID: 2175
Item Type: Article (Refereed Research - C1)
Keywords: shark fisheries; fisheries management; gear selectivity; fisheries assessment; Carcharhinus plumbeus; gillnet, mesh selectivity, SELECT, shark
Additional Information:

ISSN: 1095-9289
Date Deposited: 06 May 2009 03:51
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070403 Fisheries Management @ 50%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070402 Aquatic Ecosystem Studies and Stock Assessment @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830299 Fisheries- Wild Caught not elsewhere classified @ 100%
Citation Count from Web of Science Web of Science 8
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