Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Analysis of body size selectivity of by-catch using the cover net method for a shrimp beam trawl

  • Kim, Yonghae (Institute of Marine Industry, Department of Marine Production technology, Gyeongsang National University)
  • Received : 2015.05.05
  • Accepted : 2015.05.29
  • Published : 2015.05.31
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Abstract

Selectivity and by-catch are the main features used to define fish catch for fisheries management or to determine fishing gear efficiency. A fish girth distribution analysis was carried out to determine the retention rate of juveniles discarded and to establish common selectivity for a multispecies catch. Total body length, body weight, and girth of juvenile fish retained in the cod-end and cover net separately were collected using an 18-mm mesh cover net during 12 fishing trials with a 41-mm cod-end beam trawl. The by-catch weight ratio in the cod-end was twice that of the by-catch ratio in number. The 50% selectivity of body length and 50% girth of redfin velvet fish were not significantly different between the cod-end and cover net, whereas those of other fish species were significantly different between the cod-end and cover net. The difference in 50% selectivity girth of other fish between the cod-end and cover net was similar between cod-end mesh size and cover net mesh size. Furthermore, the difference in 50% body length selectivity of other fish between the cod-end and cover net was almost double the difference in girth. Girth selectivity in a multispecies catch using towed fishing gear was effectively used to determine fish and net mesh size.

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  1. Bycatch Reduction by Experimental Shaking Codend Attached with Canvas in a Bottom Trawl vol.18, pp.3, 2015, https://doi.org/10.5657/FAS.2015.0325