Ali KARA

İzmir Körfezi'nde iri sardalya (Sardinella aurita Valanciennes,1847) balığı avcılığında kullanılan multiflament galsama ağların seçiciliği

Bu çalışma Izmir Körfezi'nde iri sardalya (Sardinella aurita Valenciennes,1847) avcılığında kullanılan multiflament galsama ağlarının seçicilik özelliklerinin belirlenmesi amacıyla l Eylül 2001-31 Mart 2002 tarihleri arasında yapılmıştır. Çalışmada kullanılan ağların göz açıklıkları düğümden düğüme 20, 21, 22 ve 23 mm'dir. Ağlar birbirine eklenerek aynı zamanda ve aynı sahada kullanılmıştır. Ağların iplik kalınlığı 210d/3no, asılma oranı E=0.67dir. Seçicilik parametreleri Holt (1963) tarafından geliştirilen indirekt tahmin metodu kullanılarak belirlenmiştir. Yakalanan balıkların boy dağılımı 14.1-21.5 cm'dir. 20, 21, 22 ve 23 mm ağ gözlerinde 5. aurita'nm optimum yakalama boyu sırası ile 16.36,17.17,17.99 ve 18.81 cm'dir. Tahmin edilen ortak seçicilik faktörü ve standart sapma değeri 8.18 ve 1.226 dir.

Selectivity of multifilament gill nets used in round sardinella (Sardinella aurita Valenciennes,1847) in Izmir Bay

This study was conducted between 1 September 2001 and 31 March 2002 in order to establish the selectivity of multifilament gill nets used to catch Round Sardinella (Sardinella aurita Valenciennes, 1847) in Izmir Bay. Mesh sizes (bar lengths ) of the nets employed in the study 20, 21, 22 and 23 mm. The gill nets were combined end-to-end and set simultaneously at the same site. The twine width of the gill nets in 210d/3 no, and its hanging ratio, E= 0.67. Selectivity parameters were estimated using the indirect method proposed by Holt (1963). The size range offish caught was 14,1-21.5 cm. The optimum catch lengths of S. aurita in 20, 21, 22 and 23 mm mesh size were 16.36, 17.17, 17.99 and 18.81 cm, respectively. Estimated values od common selection factor and standard deviation were 8.18 and 1,226, respectively.

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