Sinop Yarımadası civarında (Karadeniz, Türkiye) dip uzatma galsama ağlarında yunusların balıkları çalmaları üzerine akustik pingerlerin etkisi

Bu çalışma, Sinop yarımadası civarında 18 Aralık 2005 ve 21 Ocak 2006 tarihleri arasında 34mm ve 44mm dip uzatma solungaç ağlarında yunusların balıkları çalmaları üzerine akustik pingerlerin etkisini belirlemek amacıyla yürütülmüştür. Araştırmada, ağ göz açıklığı 34mm ve 44mm olan monofılament tora sahip sade dip uzatma ağları ve 4 adet AQUAmark 200, akustik cihaz kullanılmıştır. Akustik cihazlar 34mm ve 44mm ağ göz açıklığındaki ağların mantar yakasının uç kısımlarından, 50 kulaçlık mesafeye bağlanarak (cihazlı ağlar) denize bırakılmıştır. 34mm ağ gözü açıklığına sahip aktif ve kontrol ağlarla sırasıyla, toplam 76kg, 1115 adet ve 25,0kg, 292 adet, 44mm ağ gözü açıklığına sahip aktif ve kontrol ağlarıyla ise sırasıyla, toplam 90,5kg, 749 adet ve 18,5kg, 230 adet balık yakalanmıştır. Yine, 34mm ağ gözü açıklığına sahip aktif ağlarla kontrol ağlara göre ağırlık ve sayı olarak sırasıyla, 3,0 kat ve 3,8 kat, 44mm ağ gözü açıklığına sahip aktif ağlarla ise ağırlık ve sayı olarak sırasıyla, 4,9 kat ve 3,3 kat daha fazla balık yakalandığı belirlenmiştir (p

The effeccts of acoustic pingers on dolphins depredation around Sinop peninsula (Black Sea, Turkey) in bottom-set gillnets

This study was carried out to determine the effects of acoustic pingers on dolphins depredation in the monofilament bottom gillnets of 34 and 44mm mesh sizes around the Sinop Peninsula between 18 December 2005 and 21 January 2006. The monofilament bottom gillnet of 34 and 44mm mesh sizes and 4 acoustic device (AQUAmark 200) were used. Acoustic devices were placed on the edge of float line with 50 fathom interval (active) then left to the sea . A total of 76kg and 1115 fish and 25kg and 292 fish were caught by active of 34mm mesh size and control, respectively, while 90.5kg and 749 fish and 18.5kg and 230 fish were caught by active of 44mm mesh size and control, respectively. 3.0-4.9 and 3.3-3.8 folds more products as weight and numerical, respectively, were obtained by active of 34 and 44mm mesh size (with acoustic device) than by control net (without acoustic device) (p

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