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Spatial overlap between the leafscale gulper shark and the black scabbardfish off Portugal

Published online by Cambridge University Press:  19 December 2013

Nuno Veiga ,
Teresa Moura  and
Ivone Figueiredo
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Abstract

Information about the spatial distribution of bycatch species and their spatial overlap with the target species is essential for fisheries management. The present study used fishery-dependent data (vessel monitoring systems, logbooks and official daily landings) to study the spatial distribution and overlap between black scabbardfish Aphanopus carbo and leafscale gulper shark Centrophorus squamosus taken by the longline fishery operating off mainland Portugal. The geostatistical method kriging was applied to estimate the distribution of the leafscale gulper shark in relation to black scabbardfish and thus assess the impact of the fishery on the leafscale gulper shark. Results indicate that in fishing grounds where the black scabbardfish is more abundant, the relative occurrence of deepwater sharks is reduced. These findings have implications for alternative management measures to be adopted in this particular fishery, particularly where it concerns the minimization of deepwater shark bycatch.

Keywords

Spatial distributionSpatial overlapBycatchDeep-sea fishCentrophorus squamosusAphanopus carboNortheast Atlantic Ocean
Type
Research Article
Information
Aquatic Living Resources , Volume 26 , Issue 4 , October 2013 , pp. 343 - 353
Copyright
© EDP Sciences, IFREMER, IRD 2013

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