期刊
ICES JOURNAL OF MARINE SCIENCE
卷 64, 期 8, 页码 1598-1602出版社
OXFORD UNIV PRESS
DOI: 10.1093/icesjms/fsm123
关键词
bycatch reduction device; fishery; flume tank; hydrodynamic performance; juvenile and trash excluder device; shrimp trawl; Vietnam
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 BIRD 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.
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