Survival of fish after escape from a 40 mm stretched diamond mesh trawl codend in the Aegean Sea

Faik Ozan Düzbastilar; Celalettin Aydin; Gülnur Metin; Altan Lök; Ali Ulaş; Aytaç Özgül; Benal Gül; Cengiz Metin; Hüseyin Özbilgin; Tuğçe Şensurat; Adnan Tokaç

doi:10.3989/scimar.2010.74n4755

Autores/as

Faik Ozan Düzbastilar Ege University, Centre of Underwater Research and Application
Celalettin Aydin Ege University, Fisheries Faculty
Gülnur Metin Ege University, Fisheries Faculty
Altan Lök Ege University, Centre of Underwater Research and Application
Ali Ulaş Ege University, Centre of Underwater Research and Application
Aytaç Özgül Ege University, Centre of Underwater Research and Application
Benal Gül Ege University, Fisheries Faculty
Cengiz Metin Ege University, Centre of Underwater Research and Application
Hüseyin Özbilgin Mersin University, Fisheries Faculty
Tuğçe Şensurat Ege University, Graduate School of Natural and Applied Sciences
Adnan Tokaç Ege University, Fisheries Faculty

DOI:

https://doi.org/10.3989/scimar.2010.74n4755

Palabras clave:

tasa de supervivencia, escapes, red de arrastre, descartes y capturas acompañantes, mar Egeo

Resumen

Este estudio tuvo como objetivo determinar las tasas de supervivencia de tres especies de peces, cherna afanecada o merillo (Serranus hepatus), chaparrudo (Gobius niger) y raspallón (Diplodus annularis), después de escapar de un copo con mallas de 40 mm romboidales de polietileno (PE). Los experimentos fueron realizados en el Mediterráneo Oriental, en septiembre de 2007 utilizando una red de arrastre de fondo convencional con 600 mallas alrededor de la boca. La duración estándar fue de 15 minutos de arrastre para todos los lances. La velocidad de arrastre varió entre 2.0 y 2.5 nudos. Los peces que escapaban del copo eran retenidos por un sobrecojo, el cual quedaba separado del copo mediante aros que facilitan el escape en buenas condiciones entre ambos paños. Al final de cada lance, las cubiertas del sobrecopo se separaban del copo y se fijaban al fondo del mar a profundidades entre 19 y 28 m y fueron observados por buceadores durante los siete días siguinetes. Al octavo día se contaron y midieron los sobrevivientes. Los porcentajes de supervivencia medios de control y en las jaulas experimentales resultaron ser del 97.1% y 98.3% para la cherna afanecada; 69.0% y 77.2% para el chaparrudo y 97.5% y 98.6% para el raspallón.

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