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- Title
Out with the old and in with the new: T90 codends improve size selectivity in the Canadian redfish (Sebastes mentella) trawl fishery.
- Authors
Cheng, Zhaohai; Winger, Paul D.; Bayse, Shannon M.; Kebede, Gebremeskel Eshetu; DeLouche, Harold; Einarsson, Haraldur Arnar; Pol, Michael V.; Kelly, David; Walsh, Stephen J.
- Abstract
The size selectivity of four codends were compared in the Gulf of St. Lawrence, Canada, redfish fishery (Sebastes mentella), including the regulated diamond mesh codend with a mesh opening of 90 mm (T0) and three experimental codends of different mesh openings (90, 100, 110 mm) in which the netting is turned 90° to the direction of tow (T90). Results for the regulated codend showed that there was little size selection, catching greater than 97% of redfish over all of the length classes observed. Considering the fished population, the smallest T90 codend would catch 30% fewer redfish under the minimum landing size (MLS) of 22 cm compared with the T0 codend, but would also lose 16% of catch above 22 cm. The T90 codend with 100 mm mesh opening had the same size selectivity as the smallest T90 codend. The 110 mm T90 codend would catch 50% less redfish below MLS but lose 40% of redfish above MLS. Overall, results show that T90 codends improve size selectivity in which large proportions of undersized fish are successfully released.
- Subjects
PERSIAN Gulf; CANADA; RED drum (Fish); FISHERIES; TRAWLING; SIZE; FISHES; SHELLFISH fisheries; SMALL-scale fisheries; FISHERY management
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2020, Vol 77, Issue 10, p1711
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2020-0063