İzmir Körfezi'nde ısparoz balığı (Diplodus annularis L.,1758) avcılığında kullanılan monoflament galsama ağlarının seçiciliğinin araştırılması

Isparoz, Izmir Körfezi'nde demersal balıklar içerisinde en baskın olanlardan biridir. Isparoz balıkları için 26-27-28 mm göz açıklığmdaki galsama ağlarının seçicilik eğrisinin hesaplanmasında Holt (1963) metodu kullanılmıştır. 26-27 ve 28 mm ağ göz açıklığında ısparoz balığının optimum yakalanma boyu sırasıyla, 12.66-13.15 and 13.64 cm bulunmuştur. Hesaplanan ortak seçicilik faktörü ve ortak standart sapma değerleri sırasıyla, 4.872 ve 0.693 dir. İzmir Körfezi'nde ısparoz balığının ilk üreme boyu ile avcılıkta kullanılan 26, 27 ve 28 mm'lik ağların, optimum yakalama boylan karşılaştınlmıştır. Buna göre, 26 mm göz açıklığına sahip ağın izmir Körfezi'nde ısparoz stoklan stoklan üzerinde bir av baskısı oluşturduğu tespit edilmiştir. 27, 28 mm ağlar ise böyle bir sorun oluşturmamaktadır.

Investigstions of the selectivty of monoflament gillnets used in annular sea bream fishng (Diplodus annularis L.,1758) in Izmir Bay (Aegean Sea)

Annular sea bream (Diplodus annularis L., 1758) is one of the most abundant species among demersal fisheries in Izmir Bay (Aegean Sea). Selection curves of gill nets of 26-27-28 mesh size (nominal bar length) for annular sea bream are calculated using Holt (1963) methods. The optimum catch lengths of Annular sea bream in 26-27 and 28 mm mesh size were 12.66-13.15 and 13,64 cm, respectively. Estimated values of common selection factor and common standard deviation were 4.872 and 0.693, respectively. Lenghts at first maturity of Annular Sea Bream in Izmir Bay were compared with the optimum catching lenghts of the monofilament gill nettings create a catching pressure on the Annular Sea Bream sources in Izmir Bay. On the other hand, gillnets of 27 and 28 mm do not cause such a problem at all.

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