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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on October 8, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(8):1598-1602; doi:10.1093/icesjms/fsm123
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Assessment of a juvenile and trash excluder device in a Vietnamese shrimp trawl fishery

Steve Eayrs1,, Nguyen Phong Hai2 and Janet Ley1

1 Australian Maritime College, PO Box 21, Beaconsfield, Tasmania 7270, Australia
2 University of Fisheries, Nha Trang City, Khanh Hoa Province, Vietnam

Correspondence to S. Eayrs: current address: Gulf of Maine Research Institute, 350 Commercial Street, Portland, ME 04101, USA; tel: +1 207 228 1659; fax: +1 207 772 6855; e-mail: steve{at}gmri.org

Eayrs, S., Hai, N. P., and Ley, J. 2007. Assessment of a juvenile and trash excluder device in a Vietnamese shrimp trawl fishery. – ICES Journal of Marine Science, 64: 1598–1602.

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.

Keywords: bycatch reduction device, fishery, flume tank, hydrodynamic performance, juvenile and trash excluder device, shrimp trawl, Vietnam

Received 1 September 2006; accepted 21 June 2007; advance access publication 8 October 2007.


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