Out with the old and in with the new: T90 codends improve size selectivity in the Canadian redfish (Sebastes mentella) trawl fishery
| Autor: | Shannon M. Bayse, Zhaohai Cheng, Gebremeskel Eshetu Kebede, David M. Kelly, Stephen J. Walsh, Michael Pol, Paul D. Winger, Haraldur Arnar Einarsson, Harold DeLouche |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Canadian Journal of Fisheries and Aquatic Sciences. 77:1711-1720 |
| ISSN: | 1205-7533 0706-652X |
| DOI: | 10.1139/cjfas-2020-0063 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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