A study on the age, growth and reproduction of Aspius vorax (Heckel, 1843) (Cyprinidae) in Atatürk Dam Lake (Euphrates River), Turkey
Öz
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 54g to 4317g, respectively. The relationship of fork length (LF) and scale radius (S) was estimated as: LF=-95.6669+172.254 S, (r2= 0.669). L∞ 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 LF (r2=0.8686) for females, and Log W =-4.7247+2.9051 Log LF (r2=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.
Anahtar Kelimeler
Aspius vorax Growth Parameters Condition Factor Fecundity Gonadosomatik index
A study on the age, growth and reproduction of Aspius vorax (Heckel, 1843) (Cyprinidae) in Atatürk Dam Lake (Euphrates River), Turkey
Öz
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 54g to 4317g, respectively. The relationship of fork length (LF) and scale radius (S) was estimated as: LF=-95.6669+172.254 S, (r2= 0.669). L∞ 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 LF (r2=0.8686) for females, and Log W =-4.7247+2.9051 Log LF (r2=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.
Anahtar Kelimeler
Aspius vorax Growth Parameters Condition Factor Fecundity Gonadosomatik index
Ayrıntılar
| Birincil Dil | Türkçe |
|---|---|
| Bölüm | Makaleler |
| Yazarlar | |
| Yayımlanma Tarihi | 1 Nisan 2011 |
| Yayımlandığı Sayı | Yıl 2011 Cilt: 11 Sayı: 2 |