S. Ahmet OYMAK, Erhan ÜNLÜ, Arif PARMAKSIZ, Necmettin DOĞAN

A study on the age, growth and reproduction of Aspius vorax (heckel, 1843) (cyprinidae) in Atatürk Dam Lake (Euphrates River), Turkey

Bu çalışmada, Eylül 2007 ile Ağustos 2008 arasında Atatürk Baraj Gölü’nden (Fırat Nehri) yakalanan Aspius vorax türünün yaş, büyüme ve üreme özellikleri belirlenmiştir. Örnekler II-IX yaş grupları arasında dağılım göstermiştir. Gözlenen eşey oranı 1:1,75 (dişi/erkek) olarak belirlenmiştir. İncelenen örneklerin çatal boyu 184-863 mm, ağırlıkları ise 54-4.317 g olarak ölçülmüştür. Çatal boy ($L _F$) ve radius çapı (S) ilişkisi: $L _F$=-95,67+172,254 S, ($r^ 2$= 0,669) şeklinde hesaplanmıştır. $L _\infty$ değeri dişilerde 158,36 cm erkeklerde 218,47 cm, boy-ağırlık ilişkisi dişilerde Log W = -3,424 + 2,4297 Log $L _F$ ($r^ 2$=0,8686), erkeklerde Log Log W = -4,7247 + 2,9051 Log $L _F$ ($r^ 2$=0,9549) olarak. Ortalama somatik kondisyon dişilerde 1,069, erkeklerde ise 1.062 olarak hesaplanmıştır. En yüksek değer ise dişilerde kasım (K=1,23), erkeklerde ise eylül ve ekim (K=1,13) aylarında görülmüştür. İncelenen örneklerde erkeklerin 3. yıldan itibaren eşeysel olgunluğa ulaştıkları belirlenmiştir. Bununla birlikte daha genç yaşlara ait dişi birey elde edilmediği için dişilerde ilk eşeysel olgunluk yaşı tam ol

Anahtar Kelimeler:

Cyprinidae, yaş, döllenme gücü, gonadosomatik indeks, üreme, büyüme, Türkiye

Atatürk Baraj Gölü (Fırat Nehri, Türkiye)’nde yaşayan Aspius vorax’ın heckel, 1843 yaş, büyüme ve üremesi üzerine bir çalışma

In this study, the age, growth and reproduction characteristics of Aspius vorax, which were caught from Atatürk Dam Lake (Euphrates River) between September 2007 and August 2008 were determined. The age composition of the specimens ranged between II and IX age groups. The observed sex ratio was 1:1.75 (females/males). The fork length and weight of the individuals that were examined ranged from 184 to 863 mm and from 54 g to 4,317 g, respectively. The relationship of fork length ($L _F$) and scale radius (S) was estimated as: $L _F$=-95.6669+172.254 S, ($r^ 2$= 0.669). $L _\infty$ values were calculated to be 158.36 cm for females and 218.47 for males. Length - weight relationships were Log W =-3.4242+2.4297 Log $L _F$ ($r^ 2$=0.8686) for females, and Log W =-4.7247+2.9051 Log $L _F$ ($r^ 2$=0.9549) for males. Mean somatic condition of females and males were estimated as 1.069 and 1.062, respectively. The highest values of the somatic condition were determined in the November for females (K=1.23) and in the September and October (K=1.13) for males. Males matured during their third year of life in the studied samples, but due to lacking of young female specimens, the first maturity age for female was not determined. However, all those females examined at age 4 and over were seen to reach mature.

Keywords:

Cyprinidae, age, fecundity, gonadosomatic index, reproduction, growth, Turkey,

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