Selectivity of commercial, larger mesh and square mesh trawl codends for deep water rose shrimp <em>Parapenaeus longirostris</em> (Lucas, 1846) in the Aegean Sea

Hakan Kaykaç; Adnan Tokaç; Hüseyin Özbilgin

doi:10.3989/scimar.2009.73n3597

Autores/as

Hakan Kaykaç Fisheries Faculty, Ege University
Adnan Tokaç Fisheries Faculty, Ege University
Hüseyin Özbilgin Mersin University, Fisheries Faculty

DOI:

https://doi.org/10.3989/scimar.2009.73n3597

Palabras clave:

Parapenaeus longirostris, tamaño de malla, forma del malla, rombo, malla cuadrada

Resumen

Se estudian las diferencias entre la selectividad de los copos comerciales (40 mm de malla de diamante – 40D); copos de malla más grande (48 mm de malla de diamante – 48D), y copos de malla cuadrada (40 mm – 40S), en la pesquería de Parapenaeus longirostris en aguas internacionales del mar Egeo. Para su estudio se utilizó el método del sobrecopo, y para su análisis, se tuvo en cuenta la variación intra-lances. Los resultados indican un incremento de los valores de L₅₀ cuando se incrementa el tamaño de malla, y también con el uso de la malla cuadrada. Los resultados demuestran que el copo comercial actual (40D), no es suficientemente selectivo para P. longirostris en relación a la talla de primera madurez. El cambio, la malla de 48D, produce una mejora significativa en la selectividad cercana al 15% de incremento en los valores de la L₅₀ (longitud del caparazón de 14.5 mm para 40D y 16.6 mm para 48D). Igualmente, la malla 40S, la cual ha sido legislada recientemente por la UE en aguas del Mediterráneo, muestra un incremento de la selectividad aproximadamente de un 12% en los valores de la L₅₀ (16.3 mm) respecto a la de 40D. No obstante, a pesar de estas mejoras, los copos de 48D y 40S, todavía deberían ser ampliados para obtener selectividades más elevadas y acercarse a la talla de primera madurez (20 mm de caparazón).

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