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Assessment of a juvenile and trash excluder device in a Vietnamese shrimp trawl fishery
journal contributionposted on 2023-05-16, 21:18 authored by Eayrs, S, Hai, NP, Ley, JA
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. Â© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved.
Publication titleI C E S Journal of Marine Science: (International Council for The Exploration of The Sea)
Department/SchoolInstitute for Marine and Antarctic Studies
PublisherInternational Council Exploration Sea
Place of publicationCopenhagen, Denmark