Multifilament Gillnet and trammel net selectivity for the silver crucian carp (Carassius gibelio Bloch, 1782) in Eğirdir Lake, Isparta, Turkey

Bu çalışmada, multi filament materyalden yapılmış 32, 40, 50, 60, 70, 80, 90 mm göz açıklığındaki solungaç ve 100, 110, 120, 130, 140 mm göz açıklığındaki fanyalı uzatma ağlarının, gümüşi havuz balığı avcılığındaki seçiciliği belirlenmiştir . Saha çalışması, Eğirdir Gölünde iki farklı istasyonda, Aralık-2009 ve Nisan -2010 döneminde aylık olarak toplam 10 avcılık operasyonu ile gerçekleştirilmiştir. Seçicilik parametrelerinin belirlenmesinde SELECT metot kullanılmıştır. Araştırma süresince 7 ,3 -34 ,8 cm boy aralığında 592 adet balık yakalanmıştır. Solungaç ağları için en düşük sapmayı veren Bi-modal modeline göre yapılan hesaplamalar sonucunda, 32, 40, 50, 60, 70, 80, 90 mm göz açıklığındaki solungaç ağlarının optimum yakalama boyları sırasıyla 8 ,74, 10 ,92, 13 ,65, 16 ,38, 19 ,11, 21 ,84 ve 24 ,57 cm olarak; fanyalı ağlar için en düşük sapmayı veren Normal scale mo deline göre yapılan hesaplamalar sonucunda 100, 110, 120, 130, 140 mm göz açıklığındaki fanyalı ağların optimum yakalama boyları sırasıyla 27 ,20, 29 ,92, 32 ,64, 35 ,36 ve 38 ,08 cm olarak bulunmuştur.

Eğirdir Gölü nde (Isparta -Türkiye) Gümüşi havuz balığı için (Carassius gibelio Bloch, 1782) multifilament solungaç ve fanyalı uzatma ağı seçiciliği

The aim of this study was determine the selectivity of gillnet and trammel net with different mesh sizes for C. gibelio in Eğirdir Lake. Gillnets with mesh sizes of 32, 40, 50, 60, 70, 80 and 90 mm; and trammel nets with of 100, 110, 120, 130 and 140 mm were tested for catching of C. gibelio . Fieldwork was carried out in two different station of Eğirdir Lake, in a monthly period from December 2009 to April 2010 and with a total of 10 catching trials. The SELECT method was used to determine the selectivity parameters. Number of 592 C. gibelio species were caught in the experiments which the length s ranged between 7.3 - 34.8 cm. According to the Bi-modal model which gave the lowest deviation for multifilament gillnets, the optimum lengths were determined as 8.74, 10.92, 13.65, 16.38, 19.11, 21.84 and 24.57 cm for 32, 40, 50, 60, 70, 80 and 90 mm mesh sizes respectively. Accordin g to the Normal scale model which gave the lowest deviation for trammel nets, optimum lengths were determined as 27.20, 29.92, 32.64, 35.36 and 38.08 cm for 100, 110 , 120, 130 and 140 mm mesh sizes in trammel net respectively.

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Turkish Journal of Fisheries and Aquatic Sciences-Cover
  • ISSN: 1303-2712
  • Başlangıç: 2015
  • Yayıncı: Su Ürünleri Merkez Araştırma Enstitüsü - Trabzon
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