İzmir Körfezi'nde sardalya (Sardina pilchardus Walbaum,1792 balığı avcılığında kullanılan galsama ağlarının seçiciliği

Bu çalışma, Türkiye denizlerinde Sardalya avcılığında kullanılan galsama ağlarının seçiciliği dir. Örnekler l Mayıs - l Eylül tarihleri arasında 12.65-12.70 ve 12.75 mm göz açıklığında ağlarla toplanmıştır. Seçicilik parametreleri Holt (1963) tarafından geliştirilen indirekt tahmin metodu kullanılarak belirlenmiştir. Yakalanan balıkların boy dağılımı 9.45-13,65cm dir. 12.65-12.70 ve 12.75 mm ağ gözlerinde S. Pilchardus'mu optimum yakalama boyu sırası ile 11.29-11.34 ve 11.3 8 cm dir. Tahmin edilen ortak seçicilik faktörü ve standart sapma değeri sırasıyla 8.93 ve 0.305 dir.

Selectivity of gillnets used in sardine fishing (Sardina pilchardus Walbaum,1792) in İzmir Bay

The present study is the mesh size selectivity of gill nets used for Sardina pilchardus (Walbaum, 1792) in Aegean sea in the cost of Turkish waters. Samples were collected with gill nets of mesh sizes (bar length) of 12.65-12.70 and 12.75 mm between 1 May and 1 Oct. 2001. Selectivity parameters were estimated using the indirect method proposed by Holt (1963). The size range offish caught was 9.45- 13.65cm. The optimum catch lengths of S. pilchardus inl2.65-12.70 and 12.75 mm mesh size were 11.29-11.34 and 11.38 cm, respectively. Estimated values of common selection factor and standard deviation were 8.93 and 0.305, respectively.

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