Demersal trol balıkçılığında yatay ayırıcı panel etkinliği

Bu çalışmada, dip trol ağlarında yatay ayırıcı panel kullanımının etkinliği araştırılmıştır. Bu amaçla, 900 göz kesimli trol ağı, giriş kısmından itibaren mantar ve kurşun yakanın birleştiği noktadan yatay olarak ikiye ayrılmış, alt ve üst panel oluşturulmuştur. Denemeler Gülbahçe Körfezinde 29.04.2013 – 08.05.2013 tarihleri arasında “EGESÜF” araştırma gemisi ile yürütülmüştür. Çekim süresi 45 dakika ile standardize edilmiştir. Alt ve üst bölümde yakalanan türlerin alıkonulması için 20 mm ağ göz boyunda düğümsüz poliamid materyalden yapılmış torbalar kullanılmıştır. Yakalanan bireyler tür bazında ayrılmış sayı ve ağırlıkları alınmıştır. Ayrıca alt ve üst torbada yakalanan barbunya (Mullus barbatus), ısparoz (Dipldus annularis), kırma mercan (Pagellus erythinus) ve izmarit’e (Spicara maena) ilişkin total boy ölçümleri yapılmıştır. Alt ve üst torbada yakalanan türlerin ağırlık olarak miktarları arasında farklılık olup olmadığı t testi ile sınanmıştır. Alt ve üst torbada yakalanan barbunya, ısparoz, k. mercan ve izmarit bireylerinin boy grupları arasında farklılığın olup olmadığı Kolmogorov-Smirnov testi ile belirlenmiştir. Toplamda 21 geçerli çekim gerçekleştirilmiştir. Ağırlık olarak tüm türlerin % 80’i alt torbada, % 20’si ise üst torbada yakalanmıştır. Ağırlık olarak alt ve üst torbada yakalananlar arasında fark bulunmuştur (P

Effectiveness of horizontal separator panel in demersal trawl net

In this study, it was evaluated that the effectiveness of horizontal separator panel in the demersal trawl net. A modified trawl net, 900 fishing circle, divided into two separate panels as lower and upper panel from the beginning of trawl mouth. Experiments were carried out in the Gülbahçe Bay/İzmir/Turkey between 29.04.2013 – 08.05.2013 with R/V “EGESÜF”. Trawl hauls are standardized at 45 minutes. Lower (LB) and upper bag (UB), which have polyamide 20 mm mesh sizes, were constructed for obtained the species in lower and upper parts. After hauling up the gear, the catches from the LB and UB were emptied onto the deck separately, sorted by species, and weighed. In addition, total lengths were measure for red mullet (Mullus barbatus), annular sea bream (Dipldus annularis), Common pandora (Pagellus erythinus) and Blotched picarel (Spicara maena). T test was utilized for differences between LB and UB catches. The Kolmogorov–Smirnov (K–S) test was used to compare length distributions of the LB and UB specimens for red mullet, annular sea bream, common pandora and blotched picarel. A totally 21 hauls were performed. In total 790.1 kg belonging to 51 species was caught. As weight 80 % of species retained in LB and 20% in UB (P

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