Dergiler / Turkish Journal of Zoology / 2007 / Cilt: 31 - Sayı: 2
Kuzeydo¤u Anadolu Çoruh Nehri Havzas›ndaki ‹ki Alabal›k (Salmo trutta) Populasyonunun Yap›s› ve Üreme Özellikleri
- Sayfa
- 185–192
- DOI
- —
Özet
Çoruh Havzas›n›n iki önemli kolu olan Anuri ve Cenker çaylar›nda yaflayan kahverengi alabal›klar›n, Salmo trutta, yafl, boy, efley ve üreme özellikleri incelenmifltir. Bal›klar Kas›m 2000-Ekim 2002 tarihleri aras›nda ayl›k olarak elektroflok yöntemi ile toplanm›flt›r. Anuri Çay›’nda yafl 0-6 aras›nda de¤iflirken, Cenker Çay›’nda 0-7 aras›nda oldu¤u, çatal boy da¤›l›m›n›n (L) Anuri Çay›’nda 4,29-29,9 cm, Cenker Çay›’nda ise 3,7-34,4 cm aras›nda gerçekleflti¤i tespit edilmifltir. Her iki populasyonun ço¤unlu¤unu 20 cm’den küçük bireyler oluflturmufltur. ‹lk efleysel olgunluk yafl› ve boyu Anuri ve Cenker çaylar›nda difli ve erkekler için s›ras›yla 1,99; 3,19 y›l ve 14,1; 17,2 cm, 1,99; 3,22 y›l ve 14,0; 17,3 cm olarak hesaplanm›flt›r. Her iki populasyonda da fekondite (F) ile boy ve a¤›rl›k aras›nda önemli iliflkiler tespit edilmifltir (P < 0,05). Fekondite Cenker Çay›’nda (392 ± 46) Anuri Çay›’ndan (308 ± 27) daha yüksek bulunmufltur (P < 0,05). Üreme her iki populasyonda da Eylül-Ekim aylar›nda gerçekleflmistir.
Abstract
The reproductive characteristics of 2 brown trout (Salmo trutta) populations were examined in 2 tributaries, the Anuri and Cenker streams, of the Çoruh River, north-eastern Turkey. Sampling was carried out by electrofishing monthly from November 2000 to October 2002. Age varied from 0 to 6 in the Anuri Stream, and from 0 to 7 in the Cenker Stream. Fork length (L) ranges were 4.29-29.9 cm and 3.7-34.4 cm for the Anuri and Cenker streams, respectively. The majority of individuals from both populations were smaller than 20 cm. While age and length at first maturity in males and females were 1.99 and 3.19 years, and 14.1 and 17.2 cm for the Anuri Stream, they were 1.99 and 3.22 years, and 14.0 and 17.3 cm for the Cenker Stream, respectively. Fecundity (F) was higher (P < 0.05) in the Cenker Stream (392 ± 46) than in the Anuri Stream (308 ± 27). Significant relationships were found between fecundity and length and weight for both populations (P < 0.05). Spawning took place in September and October in both populations.