Guo Ping ZHU, Xiao Jie DAI, Li Ming SONG, Liu Xiong XU

Size at sexual maturity of bigeye tuna Thunnus obesus (Perciformes: scombridae) in the Tropical waters: a comparative analysis

İrigöz orkinos stokları konusunda balıkçılık yönetiminde karar vermek için stoktaki cinsel olgunluğa erişen balıkların oranı ve balık büyüklüğü önemli bir referanstır. İrigöz orkinosun, Thunnus obesus %50'sinin cinsel olgunluğa ($L _{50}$) geldiği büyüklüğü araştırıldı. Tropikal Atlantik Okyanusu (TAO), yakalanan balıklardan 1.042 adet örnekleme alındı. Ayrıca veri toplanan orta-batı tropik Hint Okyanusu (WCTIO) 1,313 adet ve Doğu ve Orta Tropikal Pasifik Okyanusu (ECTPO) 391 adet balıktan elde edilen verilerde beş ortak modelden parametre $L _{50}$ tahmin etmek için kullanılmıştır. İrigöz orkinoslarda cinsel olgunluğa ulaştığı asgari çatal boy sırasıyla ECTPO bölgesinde dişi (erkek) balıklarda 104 cm (108 cm) olarak; TAO bölgesinde ise dişi (erkek) balıklarda 110 cm (110 cm) ulaştığı tespit edilirken, WCTIO bölgesinde dişilerde 94 cm olarak saptanmıştır. İrigöz orkinosların dişi bireylerinde $L _{50}$ değeri ise TAO, WCTIO ve ECTPO bölgelerinde sırasıyla 117,7 cm, 119,3 cm ve 117,5 cm tahmin edilmiştir. Ancak erkek bireylerde, $L _{50}$ değeri TAO (119,5 cm) bölgesinde WCTIO (117,7 cm) bölgesine göre daha büyük hesaplanmıştır. Sonuç olarak Akaike’nin bilgi kriteri Lysack (1980) modeli İrigöz orkinos balıklarında $L _{50}$ değerini tahmin etmek için en iyi model olarak kabul edilebilir.

Anahtar Kelimeler:

Perciformes, eşeysel olgunluk, büyüklük, üreme, Thunnus, orkinos balığı

Tropikal sulardaki irigöz orkinos Thunnus obesus (scombridae: perciformes) balıklarının cinsel olgunluk boyuna erişme oranı: karşılaştırmalı bir analiz

The size and proportions of bigeye tuna reach maturity in the stock is an important reference for decision making in fisheries management. The size at 50% sexual maturity ($L _{50}$) of bigeye tuna, Thunnus obesus, was investigated, the data was taken from the 1,042 sampling fish caught from the tropical Atlantic Ocean (TAO), 1,313 from the west-central tropical Indian Ocean (WCTIO) and 391 from the Eastern and Central Tropical Pacific Ocean (ECTPO) and five common models were used for estimating the parameter $L _{50.}$ The results showed that the observed minimum fork length that attained sexual maturity for female (male) bigeye tuna in the TAO, female (male) bigeye tuna in the WCTIO, and female bigeye tuna in the ECTPO to be around 104 cm (108 cm), 110 cm (110 cm) and 94 cm, respectively. The estimated $L _{50}$ of female bigeye tuna in the TAO, the WCTIO and the ECTPO were 117.7 cm, 119.3 cm and 117.5 cm respectively. However, for male bigeye tuna, the estimated $L _{50}$ in the TAO (119.5 cm) was larger than that in the WCTIO (117.7 cm). The Akaike’s information criterion showed that the Lysack’s (1980) model can be accepted as the best model for estimating $L _{50}$ of bigeye tuna.

Keywords:

Perciformes, sexual maturity, size, reproduction, Thunnus, tuna,

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