CELALETTİN AYDIN, Mehmet CİLBİZ, ALİ İLHAN, HASAN MUSA SARI

Gillnet and trammel net selectivity for Prussian carp (Carassius gibelio) in Marmara Lake, (Turkey)

Bu çalışmada, Marmara Gölü'ndeki gümüşi havuz balığı (Carassius gibelio Bloch, 1782) için multifilament sade ve fanyalı uzatma ağlarının seçicilik özelliklerinin belirlenmesi amaçlanmıştır. Araştırma 2012 yılında, aylık olarak 3 farklı istasyonda toplam 36 balıkçılık denemesi ile gerçekleştirilmiştir. Çalışmada aynı göz açıklıklarına (4, 6, 8 ve 10 cm) ve teknik özelliklere sahip sade ve fanyalı uzatma ağları kullanılmıştır. Seçicilik parametrelerinin tahmininde SELECT metot'dan yararlanılmıştır. En düşük sapmayı vermesinden dolayı sade ağlar için normal scale, fanyalı ağlar içinde normal location en uygun model olarak değerlendirilmiştir. 8,80-27,50 cm total boy aralığında toplam 2234 C. gibelio yakalanmıştır. 4 cm ağ göz açıklığı için model boyu sade ağlar için 12,24 cm fanyalı ağlar için 12,63 cm tahmin edilmiştir. Farklı cinsiyet grupları için tahmin edilen model boyları arasında istatistiksel olarak bir fark bulunamamıştır. Tahmin edilen model boyları, farklı yazarlar tarafından verilen 11,5 cm'lik ilk üreme boyundan oldukça yüksektir. Bu durum, istilacı bir tür olan C. gibelio ile uzatma ağları kullanarak mücadele etmeyi imkânsız kılmaktadır. Bu nedenle, sadece C. gibelio yakalaması için özel balıkçılık ekipmanlarının veya cihazlarının geliştirilmesi gerekmektedir. Ek olarak, C. gibelio üretim oranı itibariyle Türkiye'de iç su balıkçılığında ikinci sıradadır; bu nedenle, farklı işleme teknikleri kullanılarak ekonomik olarak değerlendirilmesi gerekmektedir

Marmara Gölü (Türkiye)’ndeki Gümüşi havuz balığı (Carassius gibelio) için sade ve fanyalı uzatma ağları seçiciliği

This study aimed to determine the selectivity properties of multifilament gillnets and trammel nets for Prussian carp (Carassius gibelio Bloch,1782) in Marmara Lake (Manisa, Turkey). A total of 36 fishing trials were performed with three different stations on a monthly in 2012. Nets with same mesh sizes (4, 6, 8 and 10 cm) and characters were used in gillnets and trammel nets. SELECT method was utilized to estimate the selectivity parameters. Normal scale and normal location model gave the best fit for gillnet and trammel nets respectively. A total of 2234 Carassius gibelio were caught ranges between 8.80-27.50 cm in total lengths. The model length for 4 cm mesh size was estimated as 12.24 cm for gillnets and 12.63 cm for trammel nets. No statistical differences were found between estimated model lengths for different sex groups. Model lengths are much higher than first maturity size which 11.5 cm was given by different authors. This situation makes it impossible combating with this invasive species. Therefore, special fishing equipment or devices are needs to be investigated just for caught C. gibelio. In addition, C. gibelio was the second species by production rate in Turkey inland fisheries; therefore, it should be economically evaluated using different processing techniques

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