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Square mesh codend improves size selectivity and catch pattern for Trichiurus lepturus in bottom trawl used along Northwest coast of India

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Aquaculture and Fisheries 2023年第5期8卷 564-571页

作者： Madhu Vettiyattil Bent Herrmann meenakumari bharathiamma ICAR-Central Institute of Fisheries Technology MatsyapuriWillingdon IslandCochinKerala682029India SINTEF Ocean Fishing Gear TechnologyWillemoesvej 2Hirtshals9850Denmark University of Tromsø BreivikaTromsø9037Norway DTU Aqua Technical University of DenmarkHirtshals2800Denmark Division of Fisheries Science Krishi Anusandhan Bhawan-IIIndian Council of Agricultural ResearchNew Delhi110012India

The size selectivity and catch pattern of Trichiurus lepturus in 40 mm diamond and square mesh codends were investigated in this study.A 34 m high opening trawl was used,which is a common design used by fishermen operating along the northwest coast of India,and the cover codend method was employed to determine codend *** with the changes in the length at 50%retention rate for Trichiurus lepturus with the usage of the square and diamond mesh codends,indicators to understand the exploitation pattern of this species in the fishery were assessed based on the total number of individuals and on total weight of the *** mean selection length increased and discard fraction is reduced when 40 mm square mesh codends are used in place of diamond meshes,however,it is observed that individuals at commercial length are also *** results demonstrate that mandatory use of legal mesh sizes alone will be insufficient to aid in the sustainable harvest of this species,given its estimated length at first sexual maturity of 61.2 *** is the first study to compare the size selection of this species in 40 mm diamond and square mesh codends along Northwest coast of *** of the study will help as a baseline for gear-based regulations in the region.

关键词： Size selectivity Trichiurus lepturus Square mesh Codend India

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