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Rapid fish stock depletion in previously unexploited seamounts: the case of Beryx splendens from the Sierra Leone Rise (Gulf of Guinea)

dc.contributor.authorSalmerón F.
dc.contributor.authorBáez J.C.
dc.contributor.authorMacías D.
dc.contributor.authorFernandez-Peralta L.
dc.contributor.authorRamos A.
dc.date.accessioned2020-09-02T22:28:02Z
dc.date.available2020-09-02T22:28:02Z
dc.date.issued2015
dc.identifier10.2989/1814232X.2015.1085902
dc.identifier.citation37, 3, 405-409
dc.identifier.issn1814232X
dc.identifier.urihttps://hdl.handle.net/20.500.12728/6170
dc.descriptionFish stocks associated with seamounts may be particularly susceptible to overexploitation. From January to July 2001, the Spanish Oceanographic Institute (IEO) conducted an experimental fishing survey entitled ‘Palguinea-2001’ on the seamounts of the Sierra Leone Rise. Beryx splendens (commonly called alfonsino) is the main commercial demersal fish associated with this area. The aim of this study was to investigate the effects of a demersal longline fishery targeting B. splendens on the previously unexploited small Machucambo Seamount over a short time-scale, and also to consider trends in pooled catch rate at another four seamounts. During 110 fishing days at Machucambo, a total catch of 207 tonnes of B. splendens was taken with a fishing effort of 1 309 070 hooks. A spectral analysis and red-noise spectra procedure (REDFIT) algorithm was used to identify the red-noise spectrum from the gaps in the observed time-series of catch per unit effort by weight. Our results show the potential impact of longline fishing pressure on an unexploited ecosystem – after approximately 50 fishing days, the stock appeared to decline substantially, as reflected by a marked drop in catch per unit effort. The apparent rapid decline of the stock might be related to the small size and the virgin state of the Sierra Leone seamounts. The results could be extrapolated to similar small seamounts elsewhere. © 2015 NISC (Pty) Ltd.
dc.language.isoen
dc.publisherNational Inquiry Services Centre Ltd
dc.subjectalfonsino
dc.subjectCPUE
dc.subjectdemersal fishery
dc.subjectfisheries management
dc.subjectlongline
dc.subjectdemersal fish
dc.subjectexperimental study
dc.subjectfishery management
dc.subjectlonglining
dc.subjectseamount
dc.subjectspectral analysis
dc.subjectstock assessment
dc.subjectteleost
dc.subjecttime series
dc.subjectAtlantic Ocean
dc.subjectGulf of Guinea
dc.subjectSierra Leone
dc.subjectBerycidae
dc.subjectBeryx splendens
dc.titleRapid fish stock depletion in previously unexploited seamounts: the case of Beryx splendens from the Sierra Leone Rise (Gulf of Guinea)
dc.typeArticle


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