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Giant mud crab (Scylla serrata): Relative efficiencies of common baited traps and impacts on discards

Butcher, P. A. and Leland, J. C. and Broadhurst, M. K. and Paterson, B. D. and Mayer, D. G. (2012) Giant mud crab (Scylla serrata): Relative efficiencies of common baited traps and impacts on discards. ICES Journal of Marine Science, 69 (8). pp. 1511-1522. ISSN 10543139

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Article Link(s): http://dx.doi.org/10.1093/icesjms/fss109

Publisher URL: http://www.oxfordjournals.org

Abstract

This study was initiated in response to a scarcity of data on the efficiency, selectivity and discard mortality of baited traps to target Scylla serrata. Five replicates of four traps, including "hoop nets", rigid "wire pots", and collapsible "round" and "rectangular" pots were deployed for 3, 6 and 24 h in two Australian estuaries. Trapped S. serrata were "discarded" into cages and monitored with controls over 3 d. All S. serrata were assessed for damage, while subsets of immediately caught and monitored individuals had haemolymph constituents quantified as stress indices. All traps retained similar-sized (8.119.1 cm carapace width) S. serrata, with catches positively correlated to deployment duration. Round pots were the most efficient for S. serrata and fishmostly Acanthopagrus australis (3 mortality). Hoop nets were the least efficient and were often damaged. No S. serrata died, but 18 were wounded (biased towards hoop nets), typically involving a missing swimmeret. Physiological responses were mild and mostly affected by biological factors. The results validate discarding unwanted S. serrata for controlling exploitation, but larger mesh sizes or escape vents in pots and restrictions on hoop nets would minimise unnecessary catches, pollution and ghost fishing. © 2012 International Council for the Exploration of the Sea. Published by Oxford University Press. All rights reserved.

Item Type:Article
Business groups:Animal Science
Keywords:Crustacean haemolymph limb loss Scylla serrata selectivity stress traps bait biotic factor crab estuarine environment fishery discard ghost fishing mesh size mortality perciform physiological response trap (equipment) Australia Acanthopagrus australis Crustacea Decapoda (Crustacea)
Subjects:Aquaculture and Fisheries > Fisheries > Fishery management. Fishery policy
Deposited On:12 Dec 2013 01:42
Last Modified:22 Jan 2014 05:42

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