Characterization of Bottom Trawl Discards from the Catalan Coast (NW Mediterranean)
| Autor: | Blanco, Marta, Nos, David, Lombarte, Antoni, Recasens, Laura, Company, Joan B., Galimany, Eve |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
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| Popis: | VIII International Symposium on Marine Sciences, 6-8 July 2022, Las Palmas de Gran Canaria, España Multispecific fisheries generate large amounts of discards, which is an important concern for sustainable fisheries management. Monitoring the evolution of the discards and the diversity and size of the discarded species is essential to fully assess the effects of trawling on marine ecosystems and to propose effective management measures. This study aims to advance knowledge on the discards from the Catalan bottom trawl fisheries in the NW Mediterranean Sea. Discards ratio, species composition and discarding by length were analysed from data collected on board commercial trawlers, from November 2019 to December 2020 at different areas, depths and seasons. The discard ratio varied among depths ranging from 30.5 in the shallow shelf (< 75 m depth) to 14.3 in the lower slope (500 - 800 m depth). Depth was the main factor determining the species composition of the discards according to the nMDS analysis, although spatial and seasonal variability on species composition were also observed. Individuals below the Minimum Conservation Reference Size (MCRS) in the discarded catch were more abundant in shallower depths, mainly explained by the higher abundance of European hake juveniles. This study also focused on the discards of six commercial species, four fish, i.e. European hake (Merluccius merluccius), red mullet (Mullus barbatus), black-bellied angler (Lophius budegassa), poor cod (Trisopterus capelanus), and two crustaceans, i.e. deep-water pink shrimp (Parapenaeus longirostris) and Norway lobster (Nephrops norvegicus). For all these species, the length at which 50% of individuals were discarded (L50) was lower than the Length at First Maturity (LFM) and the MCRS. Our findings provide relevant information to follow the Marine Strategy Framework Directive for the ecosystem approach to fisheries and to evaluate measures, such as gear selectivity and spatial management, for a sustainable management of trawling fisheries |
| Databáze: | OpenAIRE |
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