Assessment of a juvenile and trash excluder device in a Vietnamese shrimp trawl fishery
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Eayrs, S and Hai, NP and Ley, JA, Assessment of a juvenile and trash excluder device in a Vietnamese shrimp trawl fishery, I C E S Journal of Marine Science: (International Council for The Exploration of The Sea), 64, (8) pp. 1598-1602. ISSN 1054-3139 (2007) [Refereed Article]
In this study, we (i) identified why Vietnamese shrimp fishers land juvenile fish illegally; (ii) identified groups of fishers that would use a bycatch reduction device (BRD) to exclude these fish; (iii) studied the hydrodynamic performance of a juvenile and trash excluder device (JTED) in a flume tank; and (iv) assessed the performance of this device under commercial fishing conditions. Based on the responses of 65 fishers to a questionnaire, we found that juvenile fish are now an important economic component of the total catch, and that fishers operating larger boats were more willing to use a JTED to exclude these fish than fishers operating smaller boats. The hydrodynamic study of a JTED identified the location of low-velocity regions around the device and codend, and this information can be used to identify the location of a secondary BRD to allow more fish to escape. The at-sea assessment of this device found that 73% of juvenile fish, 16% of valuable fish, and 8% of shrimp were excluded by the JTED, although most valuable fish and shrimp were smaller than the minimum legal landing size. Overall, this loss represents a 9% reduction in revenue. Yield-per-recruit analysis indicated that this could be offset by not catching fish less than the minimum legal landing size. © 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved.
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