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IMPACT OF FISHING CAPACITY AND ENVIRONMENTAL PARAMETERS ON LANDINGS OF HEXANCHUS GRISEUS IN THE SEA OF MARMARA
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IMPACT OF FISHING CAPACITY AND ENVIRONMENTAL PARAMETERS ON LANDINGS OF HEXANCHUS GRISEUS IN THE SEA OF MARMARA
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Journal Article
IMPACT OF FISHING CAPACITY AND ENVIRONMENTAL PARAMETERS ON LANDINGS OF HEXANCHUS GRISEUS IN THE SEA OF MARMARA
2024
Overview
Between July 1967 and December 2023, 136 bluntnose sixgill sharks, Hexanchus griseus, were caught in the Sea of Marmara (SoM). Although both a generalised linear model (GLM) and the Mann-Kendall trend test indicated an increasing trend in annual landings of H. griseus, the estimated smoothing splines of the GLM regression trend line revealed a sharp decline in landings after 2017. While the capture depths ranged from 10 to 1,000 m since the early 2000s, the majority of specimens were caught in the shallow waters of the continental shelf. Deteriorating environmental conditions and increasing deoxygenation in the deep waters of the SoM coincide with a reduction in the capture depth of bluntnose sixgill sharks over the continental shelf. The evidence suggests an ongoing process of vertical habitat compression, which appears to be increasing the vulnerability of H. griseus to commercial fisheries in the SoM.
Publisher
Scientific and Research Center of the Republic of Slovenia
Subject
