Yeşildere (Rize-Türkiye)’de Yaşayan Bıyıklı Balığı (Barbus tauricus escherichi Steindachner, 1897)’ın Büyüme Parametreleri ve Mortalite Oranları
Bu araflt›rmada Yeflildere’de yaflayan Barbus tauricus escherichi (B›y›kl› Bal›k) populasyonunun baz› büyüme parametreleri ve ölüm oranlar› incelendi. Araflt›rma bölgesinden Haziran 2001-Temmuz 2002 y›llar› aras›nda toplam 304 adet bal›k yakaland›. Yakalanan bireylerin boylar› en küçük 5 cm ve en büyük 23 cm, yafllar› ise 0-IV aras›nda da¤›l›m göstermektedir. Yafl tayini Bhattacharya ve pul yöntemleriyle yap›lm›flt›r. Pullara göre büyüme parametreleri; L∞ = 26,63 cm, K = 0,274, t0 = -1,009, Bhattacharya'ya göre; büyüme parametreleri ve mortalite ise L∞ = 27,11 cm, K = 0,267, t0 = -1,117, Z = 1,06 olarak belirlenmifltir.
A Preliminary Study on Growth Parameters and Mortality Rates of the Barbel (Barbus tauricus escherichi Steindachner, 1897) in Yeşildere Stream, Rize, Turkey
Growth parameters and mortality rates of the Barbus tauricus escherichi population inhabiting in Yeşildere Stream were investigated. In particular, age and size distributions, asymptotic growth, and mortality rates by age group classes were estimated. A total of 304 B. t. escherichi specimens were sampled between June 2001 and July 2002. The population consisted of 5 age classes (i.e. 0 to IV) with minimum and maximum sizes of 5 cm to 23 cm in total length. The mean growth parameters were determined as Linfinity = 26.63 cm, K = 0.274, and t0 = -1.009 with the scale method and as Linfinity = 27.11 cm, K = 0.267, t0 = -1.117, and Z = 1.06 with the Bhattacharya method.