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handle: 10261/28746
[ES] Aristeus antennatus es un recurso explotado por el arrastre de fondo a una profundidad entre 400 y 800 m. Esta gamba es la principal especie objetivo de las pescas de profundidad en el Mediterráneo Noroccidental. En este estudio se presenta el análisis demográfico de A. antennatus para Cataluña y Valericia. Se han analizado series anuales de frecuencias de tallas por sexo correspondientes a un período de 6 años (1984-1989) usando el Análisis de Cohortes por Tallas (LCA), que asume estado estacionario de la población, y usando también el Análisis de Poblaciones Virtuales (VPA). Se han realizado varios análisis de Rendimiento por Recluta (YIR) con la finalidad de dar una visión general del estado del stock. Finalmente, se ha estudiado la sensibilidad del LCA a los parámetros demográficos K (tasa de crecimiento) y M (mortalidad natural) para poder evaluar el efecto de errores en sus estimaciones. Los stocks estudiados parecen no estar muy lejos del estado estacionario y presentan un patrón de pesquería estahle, siendo posible el uso del LCA. El Y/R vs las curvas de esfuerzo muestra un nivel de explotación cercano al óptimo. Los cambios en el esfuerzo de pesca no modifican notablemente el rendimiento. La forma de estas curvas, decreciendo lentamente por su parte derecha, muestran un patrón de explotación dirigido de forma evidente a los ejemplares grandes, con lo cual los ejemplares pequeños pueden escapar al arte, o bien permanecen inaccesibles al mismo
[EN] Aristeus antennatus or "gamba shrimp" is a resource exploited by bottom trawling at a depth of between 400 and 800 m. This shrimp is the main deep demersal target species off the Western Mediterranean coast. A demographic analysis of A. antennatLls for Catalonia and Valencia is presented in this study. Anual series of length frequencies by sex were analysed over a 6 year period (1984-1989) using Length Cohort Analysis (LCA), which is based on the steady state assumption, and Virtual Population Analysis (VPA). Some yield per recruit (Y/R) analyses were performed in order to get a general view of the status of the stock. Finally, the sensitivity of LCA to demographic parameters K (growth rate) and M (natural mortality) was studied to evaluate the effect of estimation errors. The stocks studied appear not to be far from the steady state and reveal a fairly stable fishery pattern, hence it was possible to use LCA. The Y/R vs effort curves show an exploitation level close to the optimum. Fishing effort changes did not appreciably improve the yield. The shape of these curves, with a right branch decreasing very slightly, makes an exploitation pattern directed at large individuals evident, allowing the small ones to escape, or, perhaps inaccessible to the gear for other reasons
This study was undertaken within the research projects "La pesquería de Cataluña y Valencia". funded by the Commission of European Communities D.G. XIV, "Estudi Bioecològic de la Gamba", funded by the CIRIT, Generalitat de Catalunya, and "Estuidi de la Fecunditat i Reclutament de la Gamba", funded by la Caixa de Barcelona
7 páginas, 2 figuras, 8 tablas.-- Contribución a "Northwestern Mediterranean fisheries", J. Lleonart, (eds.)
Peer reviewed
Population dynamics, Aristeus antennatus, Mediterráneo noroccidental, Northwestern Mediterranean, Dinámica de poblaciones
Population dynamics, Aristeus antennatus, Mediterráneo noroccidental, Northwestern Mediterranean, Dinámica de poblaciones
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