Growth and Mortality of the Brown Trout (Salmo trutta L.) Population from Upper Aksu Stream, Northeastern Anatolia, Turkey

摘要

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 x L2.939, W = 0.015 x L2.928, and W = 0.015 x L2.932 for females, males, and overall, respectively. The estimated von Bertalanffy growth parameters were Linfinity = 33.27 cm, K = 0.107 y-1, and t0 = -1.046 y for females; Linfinity = 29.50 cm, K = 0.143 y-1, and t0 = -0.562 y for males; and Linfinity = 32.13 cm, K = 0.124 y-1, and t0 = -0.724 y for overall. Phi prime (F`) was 2.09 for females, males, and overall. Instantaneous total mortality rate (Z) was 0.58 y-1.