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Chondrichthyan species as by-catch: a review on species inhabiting Turkish waters
Bengil, E.G.T.; Basusta, N. (2018). Chondrichthyan species as by-catch: a review on species inhabiting Turkish waters. Journal of the Black Sea/Mediterranean Environment 24(2): 288-305
In: Journal of the Black Sea/Mediterranean Environment. Turkish Marine Research Foundation: Istanbul. ISSN 1304-9550
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| Trefwoord |
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| Author keywords |
Chondrichthyan species, by-catch, Turkish waters, threatened species |
| Auteurs | | Top |
- Bengil, E.G.T.
- Basusta, N.
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| Abstract |
Chondrichthyan or cartilaginous species, throughout the world, are found among fisheries by-catch. In this study, 52 studies conducted between 1991 and 2018 in Turkish waters were reviewed to assess the status of chondrichthyan species as by-catch. Geographic coverage was grouped as; Black Sea (the number of studies 5), Sea of Marmara (6), Aegean Sea (25), and Levantine Sea (16). Results showed that there were differences in by-catch amounts when sharks, rays and chimaeras were compared according to geographical grouping. When by-catch ratios of listed species were analyzed it showed that almost half of the by-catch was comprised of small spotted catshark, Scyliorhinus canicula (Linnaeus, 1758), followed by blackmouth catshark, Galeus melastomus Rafinesque, 1810. In case of rays, the most common species of by-catch was thornback ray, Raja clavata Linnaeus, 1758, followed by common stingray, Dasyatis pastinaca (Linnaeus, 1758). Among all reported species concerned, 9 were Critically Endangered, 8 Endangered, 7 Vulnerable, 13 Near Threatened, 8 Least concern, 9 were Data Deficient, according to IUCN Red List, corresponding to half of the Turkish cartilaginous fauna. This review aims to provide on the by-catch of cartilaginous species caused by scientific or commercial fisheries activities in the Turkish waters emphasizing on long-needed conservation action plans for future sustainability of these cartilaginous species. |
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