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The black hake fishery in the Mauritanian EEZ: Analysis of the possible application of a 30 cm minimum

Authors: Ramos, A. (Ana); Fernández-Peralta, L. (Lourdes); González, R.;

The black hake fishery in the Mauritanian EEZ: Analysis of the possible application of a 30 cm minimum

Abstract

La pesquería de merluzas negras Merluccius spp. es ejercida en la ZEE mauritana por una flota española de arrastreros y por algunos palangreros, La pesquería de arrastre, altamente especializada, ha disminuido su esfuerzo, mientras sus capturas se han mantenido, no superando las 12 000 toneladas anuales. Aunque con valores mensuales mas elevados durante la estación fría, los ejemplares menores de 30 cm sólo han representado más del 10 % del total anual en 1992 y 1993, años de fuerte reclutamiento. La evolución de los rendimientos y de las tallas medias de las merluzas desembarcadas, que han aumentado desde 1991, no muestran una sobrexplotación del recurso, sobre todo si tenemos en cuenta que su potencial extraíble ha sido estimado en aguas mauritanas en 133000 toneladas anuales. La aplicación de la talla mínima de 30 cm contemplada por la legislación mauritana a Merluccius spp. entraría en contradicción con las condiciones del acuerdo de pesca vigente, que impone la malla de 60 mm y autoriza la pesca fuera de las 18 millas marinas. Debido a la selectividad de la malla, a la segregación de tallas con la profundidad que presentan las merluzas negras y a las características biológicas de estas especies, de pequeño tamaño y altamente migratorias, los arrastreros españoles seguirán capturando ejemplares menores de 30 cm. La regulación mediante la talla mínima no será, por consiguiente, una medida de conservación para las merluzas negras en la ZEE mauritana.

The fishery of black hake Merluccius spp. in the Mauritanian EEZ mainly comprises a Spanish trawler fleet, as well as some longliners. The highly specialised trawling fishery has diminished its effort, while its annual landings have remained stable, not surpassing 12 000 t. In the total annual catch, individuals measuring less than 30 cm do not represent more than 10% (with the exceptions of 1992 and 1993, when the highest recruitment was recorded), although this percentage is higher during the cold season. The evolution of both the yields and the average sizes of the landed hakes, which have increased since 1991, do not indicate an overexploited resource, especially if we take into account that the potential for hake exploitation off Mauritania has been estimated at 133000 tons annually. The implementation of a minimum legal length of 30 cm for Merluccius spp., which is contemplated in Mauritanian fishing regulations, would contradict the conditions of the present fishing agreement, which imposes a 60 mm mesh size and prohibits fishing within an offshore limit of 18 nautical miles. Due to mesh selectivity, to black hakes ' size-segregation with depth, and to the biological characteristics o f these species, which are small and highly migratory, Spanish trawlers will continue to catch individuals under 30 cm. Therefore, regulation by means of minimum size would not be an adequate conservation measure for black hakes in the Mauritanian EEZ.

SI

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Spain
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Keywords

Trawling fishery, Regulación, Centro Oceanográfico de Vigo, Pesquería de arrastre, Merluccius spp., Mauritania, Pesquerías, Minimum size, Talla mínima, Regulation

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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