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Article << Previous     |     Next >>   Contents Vol 63(11)

Performance of square-mesh codends in reducing discards and by-catch in the Shark Bay scallop fishery

Arani Chandrapavan A B, Mervi I. Kangas A and Errol C. Sporer A

A Western Australian Fisheries and Marine Research Laboratories, PO Box 20, North Beach, WA 6920, Australia.
B Corresponding author: Arani.Chandrapavan@fish.wa.gov.au

Marine and Freshwater Research 63(11) 1142-1151 http://dx.doi.org/10.1071/MF12069
Submitted: 7 March 2012  Accepted: 4 September 2012   Published: 26 November 2012


 
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Abstract

The performance of square-mesh codends (as opposed to the conventional diamond mesh) was examined as a discard and by-catch reduction device for the Shark Bay saucer-scallop trawl fishery. Of the three different-sized square-mesh codends (50, 55, 60 mm) tested against the standard 100-mm diamond-mesh codend, the 50-mm square-mesh codend performed poorly with relatively high retention of small (<85 mm shell height) scallops, whereas the 55- and 60-mm square-mesh codends retained 22–33% less smaller scallops than did the diamond-mesh codend. Overall, a mean of 5% loss in commercial-sized scallops across all three square-mesh codends and significant by-catch reductions of up to 95% were achieved compared with the diamond mesh. Catch rate of prawns by the square-mesh codend was less than 2% of that of the standard prawn net. The performance of the 60-mm square-mesh codend presents a good basis for its use in commercial trials in the Shark Bay scallop trawl fishery. A move to square-mesh codends could result in a significant reduction of small scallops and by-catch and may potentially increase the catches of commercial-sized scallops as a result in improvements in water flow and net efficiency.

Additional keywords: Amusium balloti, codend selectivity, otter trawl.


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