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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 (2007) Assessment of a juvenile and trash excluder device in a Vietnamese shrimp trawl fishery. International Council for the exploration of the sea, 64 (8). pp. 1598-1602. ISSN 1015-4744

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Abstract

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.

Item Type: Article
Keywords: bycatch reduction device, fishery, flume tank, hydrodynamic performance, juvenile and trash excluder device, shrimp trawl, Vietnam.
Journal or Publication Title: International Council for the exploration of the sea
Publisher: International Council Exploration Sea
Page Range: pp. 1598-1602
ISSN: 1015-4744
Identification Number - DOI: 10.1093/icesjms/fsm123
Additional Information:

The definitive publisher-authenticated version http://www.oxfordjournals.org/

Date Deposited: 07 Apr 2008 14:20
Last Modified: 18 Nov 2014 03:34
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