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    Growth and mortality of the Brown trout (Salmo trutta L.) population from upper Aksu stream, Northeastern Anatolia, Turkey
    (Turkish Journal of Zoology, 2007) Arslan, Murat; Yıldırım, Ayhan; Bektaş, Serdar; Atasever, Ali
    Age, sex, mortality, and growth characteristics of brown trout ( Salmo trutta ) from the upper Aksu Stream were investigated. Females and males comprised 52.13% and 47.87% of the population, respectively. Age ranged from 1 to 8. The fork length (L) and total weight (W) were 5.7-22.8 cm and 2.9-142.6 g, respectively. Length-weight relationships were W = 0.015 × L 2.939 , W = 0.015 × L 2.928 , and W = 0.015 × L 2.932 for females, males, and overall, respectively. The estimated von Bertalanffy growth parameters were L ? = 33.27 cm, K = 0.107 y -1 , and t 0 = –1.046 y for females; L ? = 29.50 cm, K = 0.143 y -1 , and t 0 = –0.562 y for males; and L ? = 32.13 cm, K = 0.124 y -1 , and t 0 = –0.724 y for overall. Phi prime ( ? `) was 2.09 for females, males, and overall. Instantaneous total mortality rate (Z) was 0.58 y -1 .