Journal
FISHERIES RESEARCH
Volume 109, Issue 1, Pages 107-113Publisher
ELSEVIER
DOI: 10.1016/j.fishres.2011.01.025
Keywords
Snow crab; Trap; Escape mechanism; Size-selectivity; Underwater video
Categories
Funding
- Canadian Centre for Fisheries Innovation
- Department of Fisheries and Aquaculture
- Fisheries and Oceans Canada
- Fisheries and Marine Institute of Memorial University of Newfoundland
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Comparative fishing experiments were conducted to evaluate the selectivity and efficiency of escape mechanisms installed in traditional snow crab (Chionoecetes opilio) traps. Performance of the different trap types (control, traditional, experimental) were compared on the basis of size distribution caught, numbers of animals per trap haul (CPUEN), and size selectivity. The study demonstrated that either 95 or 100mm diameter escape mechanisms installed into traditional 14.0 cm mesh traps resulted in 38-47% fewer undersized pre-recruit (<95 mm CW) crab being captured, with no significant difference in the capture efficiency of standard (95-101 mm CW) or premium sized crab (>101 mm ON). Qualitative underwater behavioural observations were also conducted for snow crab in response to baited traps, corroborating current understandings as well as documenting new observations related to crab behaviour during capture, escape, haul-back, and interspecific competition with Atlantic cod (Gadus morhua). (C) 2011 Elsevier B.V. All rights reserved.
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