Some Aspects of the Reproductive Biology of Poor Cod (Trisopterus minutuscapelanusLacépède, 1800) in Edremit Bay (the North-Eastern Aegean Sea)

Edremit Körfezi'nden Eylül 1999 ile Aralık 2000 tarihleri arasında dip trolü ile toplanan örneklerle tavukbalığının üreme biyolojisinin bazı yönleri çalışılmıştır. Toplamda incelenen 3904 tavukbalığının 1946'sı dişi, 1576'sı erkek ve 382'si cinsiyeti tanımlanamayan bireylerden oluşmuştur. Tavukbalığının cinsiyet oranı (erkeklerin dişilere oranı) 0,34 ile 1,27 arasında değişim göstermiş ve cinsiyet oranının aylar arasında varsayılan (1:1) oranından önemli farklılıklar gösterdiği bulunmuştur. Üreme dönemi aralık'ta başlamış ve ilkbahar boyunca devam etmiştir. Yumurtlamanın büyük kısmı şubat ve mart aylarında olmuştur. Dişi bireyler için cinsel olgunluk boyu 11,4 cm olarak hesaplanmış iken, en küçük olgun dişi bireyin boyu 10,8 cm'dir. Bir defada bırakılan yumurta miktarının (verimliliği) bireyler arasında 765 yumurtadan 7958 yumurtaya kadar (ortalama: 2295 yumurta, SD: 968 yumurta) oldukça yüksek bir değişim gösterdiği bulunmuştur. Yumurta verimliliği, balık boyu ve ağırlığı ile artış göstermiştir. Göreceli doğurganlık değeri 14,2 g ile 83,6 g arasında yer alan balık ağırlıkları için 41 ile 116 yumurta/g (ortalama: 76 yumurta/g, SD: 12 yumurta/g) arasında değişmiştir.

Edremit Körfezi'nde (Kuzeydoğu Ege Denizi) Tavukbalığının (Trisopterus minutus capelanusLacépède, 1800) Üreme Biyolojisinin Bazı Yönleri

Aspects of the reproductive biology of poor cod were studied from samples collected by bottom trawl in Edremit Bay during September 1999 and December 2000. A total of 3904 poor cod specimens were investigated consisting of 1946 females, 1576 males and 382 individuals with unidentified sex. The sex ratio (males to females) of poor cod varied from 0.34 to 1.27 and significant differences were found in the unity (1:1) among months. The reproductive period started in December and continued throughout spring. The main spawning was in February and March. The length at maturity of female observed to be 11.4 cm while the smallest mature female was 10.8 cm. Batch fecundity was found to be highly variable between individuals and ranged from 765 to 7958 eggs (mean: 2295 eggs, SD: 968 eggs). Batch fecundity increased with fish length and weight. Relative fecundity varied between 41 and 116 eggs/g (mean: 76 eggs/g, SD: 12 eggs/g) for the fish weight ranged from 14.2 to 83.6 g

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