Selectivity of Standard, Narrow and Square Mesh Panel Trawl Codends for Hake (Merluccius merluccius) and Poor Cod (Trisopterus minutus capelanus)

Authors : Hüseyin ÖZBİLGİN, Zafer TOSUNOĞLU, Celalettin AYDIN, Hakan KAYKAÇ, Adnan TOKAÇ

Pages : 967-973

View : 15 | Download : 2

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The selectivity of 3 trawl codends, insert ignore into journalissuearticles values(1); a commercially used standard codend, insert ignore into journalissuearticles values(2); a narrow codend insert ignore into journalissuearticles values(100 meshes on its circumference instead of 200); and insert ignore into journalissuearticles values(3); a square mesh top panel codend, was tested for hake insert ignore into journalissuearticles values(Merluccius merluccius); and poor cod insert ignore into journalissuearticles values(Trisopterus minutus capelanus); between 8 and 24 October 2003, in the Aegean Sea. Data were collected using the covered codend technique, and analysed by means of a logistic equation with the maximum likelihood method. The results show that the commercially used standard codend insert ignore into journalissuearticles values(40 mm mesh size PE codends, 200 meshes on its circumference); retains all the hake that enter and releases only a few specimens of poor cod. The narrow codend has better selectivity than the standard codend insert ignore into journalissuearticles values(L50 = 14.28 cm for hake and 14.11 cm for poor cod);. The selectivity of the square mesh top panel codend was higher than that of the narrow codend for hake insert ignore into journalissuearticles values(L50 = 15.25 cm);, while it was similar for poor cod insert ignore into journalissuearticles values(L50 = 14.25 cm);.
Keywords : Trawl selectivity, narrow codend, square mesh panel, hake Merluccius merluccius, , poor cod Trisopterus minutus capelanus, , Aegean Sea