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Distribución y aspectos biológicos de Pagellus bellottii bellottii Steindachner, 1882 (Sparidae) en el Golfo de Guinea

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

Distribución y aspectos biológicos de Pagellus bellottii bellottii Steindachner, 1882 (Sparidae) en el Golfo de Guinea

Abstract

Durante el mes de abril de 1990 se efectuó la campaña de prospección pesquera demersal "Guinea 90", a bordo del B/C "Lagoapesca". La zona de trabajo comprendió la plataforma y el talud de Sierra Leona, Liberia, Costa de Marfil y Ghana, entre las isóbatas de 20 y 700 m de profundidad. La comunidad que presentó una mayor abundancia fue la de espáridos, siendo Pagellus bellottii bellottii Steindachner, 1882, la segunda especie dominante (7. 7% en peso de la captura total) después de Dentex angolensis Poll y Maul, 1953. Su distribución geográfica se extendió a toda el área de estudio (a excepción de la zona este de Sierra Leona) entre los límites batimétricos de 23 y 126 m. La máxima frecuencia y densidad se encontró en la banda comprendida entre 30 y 80 m. En Costa de Marfil se obtuvieron rendimientos de hasta 67.5 kg/1/2h, y un rendimiento medio de 17.2 kg/1/2h, lo que indicaría la elevada concentración de la especie en esta zona. Los ejemplares muestreados midieron entre 7 y 25 cm de longitud a la furca y presentaron distribuciones de tallas con dos modas, en 10-12 cm y en 15-16 cm, en toda el área, sin que fuera observada una segregación clara de las tallas con la profundidad. Los machos fueron casi siempre dominantes en las capturas, ofreciendo las "sex ratio" valores que variaron entre 1:0.33 y 1:1.06 (♂:♀). Los parámetros de la ecuación longitud a la furca - peso vivo, calculada con 302 ejemplares,fueron: a=0.010886 y b=3. 236784, con un r=O. 96098.

Distribution and biological aspects of Pagellus bellottii bellottii Steindachner, 1882 (Sparidae), in the Guinean Gulf. During the month of April 1990, the fishing survey "Guinea 90" on board the F/V Lagoapesca was carried out. The sampled area corresponds to shelf and slope waters off the coast of Sierra Leone, Liberia, Cote d'Ivoire and Ghana, from 20 to 700 m in depth. The greatest abundance corresponded to the Sparidae Community. Pagellus bellottii bellottii Steindachner, 1882 was the second dominant species (7. 7% of the total catch weight). lts geographycal distribution was wide, spreading throughout nearly all the study area (except for the western zone of Sierra Leone) between 23 and 126 m of bath~ metric range. Both the frecuency and the density were the highest from the 30 to 80 m band. Yields in Cote d'Jvoire reached up 67.5 kg/ 1/2 h and mean yield of 17.2 kg/ 1/2 h, which would indicate the high species concentration in this zone. Sampled specimens ranged from 7 to 25 cm in fork length, showing size distribution with two modal classes, at 10-12 and 15-16 cm in the whole area; a clear size segregation in relation to depth was not observed. Males were always dominant in catches, with sex ratio values varyingjrom 1:0.33 to 1:1.06 (♂ :♀). Fork length - weight equation parameters, calculated with 302 specimens, were: a=0.010886 and b=3.236784, with r=0.96098.

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Keywords

África, Guinean Gulf, Distribución, Distribution, Golfo de Guinea, Tallas, Abundance, Abundancia, Centro Oceanográfico de Vigo, Pagellus bellottii bellottii, Africa, Sizes, Pesquerías, Size-weight relationships, Sex ratio, Relaciones talla-peso

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