Gillnet selectivity for pikeperch (Sander lucioperca Linnaeus, 1758) in Suğla Lake (Konya-Turkiye)

Öz

The aim of this study was to determine the length selectivity of gillnet with 3.2, 4, 5, 6, 7, 8, 9 cm mesh size fishing of the Sander lucioperca in Suğla Lake. Fieldwork was carried out in eight different stations of Suğla Lake in 2014 commercial fishing season. The Select method was used to determine the selectivity parameters. A total of 801 S. lucioperca were caught in the fishing trial length range between 15.6 and 48.3 cm. According to the bi-modal which gave the lowest deviation for gillnets, model lengths were estimated as 16.28,20.35, 25.44, 30.53, 35.61, 40.70 and 45.79 cm for 3.2, 4, 5, 6, 7, 8, 9 cm mesh sizes respectively. In consideration of both MLS and length at first maturity, gillnets with fewer than 6 cm mesh size should not be used for S. lucioperca fishing in Suğla Lake.

Anahtar Kelimeler

• small scale fisheries
• length selectivity
• sustainability
• fisheries management

Suğla Gölü (Konya-Türkiye) Sudak Balığı (Sander lucioperca Linnaeus, 1758) Avcılığında Sade Uzatma Ağı Seçiciliği

Öz

Bu çalışmada, monofilament materyalden yapılmış 3.2, 4, 5, 6, 7, 8, 9 cm göz açıklığındaki sade uzatma ağlarının Sander lucioperca avcılığındaki seçiciliği araştırılmıştır. Saha çalışması, Suğla Gölü’nde sekiz farklı istasyonda 2014 yılı avcılık sezonu içerisinde gerçekleştirilmiştir. Seçicilik parametrelerinin belirlenmesinde SELECT metot kullanılmıştır. Araştırma süresince 15,6 – 48,3 cm toplam boy aralığında 801 adet balık yakalanmıştır. En düşük sapmayı veren bi-modal’e göre yapılan değerlendirmeler sonucunda, 3.2, 4, 5, 6, 7, 8, 9 mm göz açıklığındaki solungaç ağlarının model boyları sırasıyla 16.28, 20.35, 25.44, 30.53, 35.61, 40.70 ve 45.79 cm olarak tahmin edilmiştir. Türün hem ilk üreme boyu hem de yasal boy sınırı göz önünde bulundurulduğunda Suğla Gölü’nde S. lucioperca avcılığında 6 cm’den daha küçük göz açıklığındaki monofilament ağlar kullanılmamalıdır.

Anahtar Kelimeler

• Küçük ölçekli balıkçılık
• boy seçiciliği
• sürdürülebilirlik
• balıkçılık yönetimi

Kaynakça

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