PDF 4062.pdf | Request a copy Full text restricted

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
Authors/Creators:	Eayrs, S and Hai, NP and Ley, JA
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
ISSN:	1015-4744
DOI / ID Number:	https://doi.org/10.1093/icesjms/fsm123
Additional Information:	The definitive publisher-authenticated version http://www.oxfordjournals.org/
Item Statistics:	View statistics for this item

Actions (login required)

Item Control Page