The fishery for black scabbardfish (Aphanopus carbo Lowe, 1839) in the Portuguese continental slope |
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Authors: | Pedro Bordalo-Machado Ivone Figueiredo |
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Institution: | (1) Departamento de Recursos Marinhos, INRB – IPIMAR, Av. de Brasília, 1449-006 Lisboa, Portugal |
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Abstract: | The black scabbardfish is a deep-sea teleost species with high commercial interest in the NE Atlantic. While it is caught
by large offshore trawlers in the North of Europe, in the south it is captured by artisanal longlines. On the Portuguese continental
slope, in the south of ICES Division IXa, a longline fleet has been engaged in the capture of black scabbardfish for more
than 20 years. This paper reviews and analyses the features of this fishery from a temporal perspective based on information
from different data sources. The fishery is based on the port of Sesimbra, where a family type fishing community strives to
keep catches profitable without altering the artisanal features that characterizes the fleet. Although the fleet has experienced
some technical improvements through time, the fishing operations and strategy have changed very little. Fishing occurs at
particular areas on the slope, where individual vessels have their own fishing grounds. Annual landings surpassed 4,000 tonnes
in the early 1990’s, but decreased to nearly 3,000 tonnes and have remained at this level since 2000. The length structure
of the landings was stable from 2000 to 2005, with a modal (total length) class of 1,090 mm. Monthly landings per unit effort
estimated by a generalized linear model did not present any marked trend for the period 2000–2004. The landings reported in
mainland Portugal were compared with the ones from other regions of the ICES area and the different characteristics of the
fisheries operating in the north and south of Europe were analysed. |
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Keywords: | Artisanal Deep-sea Landings Longline Length structure Generalized linear model |
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