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Tentacle-breakage mechanism for the neon flying squid Ommastrephes bartramii during the jigging capture process
- Source :
-
Fisheries Research . Jun2012, Vol. 121-122, p9-16. 8p. - Publication Year :
- 2012
-
Abstract
- Abstract: In squid jigging operations for neon flying squid (Ommastrephes bartramii), 30–40% of hooked squid are estimated to fall off (i.e., become detached) from the jigs during the drum-hauling process, caused by breakage/severance of the hooked tentacle(s). Reducing fall-off events can lead to higher productivity and more efficient use of the squid resource. In the present study, there were 950 fall-off events either directly observed or assessed from the residue of tentacle(s) left on the jigs compared with the 1720 total captures, which comprises 35.6% of 2670 total hooked squids. The fall-off ratio according to the mantle length (ML) was examined using logistic curve analysis and a higher fall-off ratio for smaller squid was confirmed through size selectivity curve analysis. F 50, the 50% probability of fall off from the jig, was estimated to be 37.4cm ML. The breaking strength of a single tentacle was determined to be similar to the body weight (BW) of squid smaller than 41.4cm ML, indicating a high possibility of tentacle breakage in the case of 1 tentacle grabbing the jig for smaller-sized squid. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 01657836
- Volume :
- 121-122
- Database :
- Academic Search Index
- Journal :
- Fisheries Research
- Publication Type :
- Academic Journal
- Accession number :
- 74551324
- Full Text :
- https://doi.org/10.1016/j.fishres.2011.12.016