Growth and mortality of brown trout, Salmo trutta fario

The length-weight relationship, age, growth parameters, sex ratio, mortality and exploitation rate of salmo trutta fario were determined in lar dam. the sex ratio (male: female) was 1:1.84 which differed significantly from the expected 1:1. the length-weight regression was (females) and (males) indicating a negative allometric growth for both sexes. growth parameters were estimated as l? = 45.0 cm, k = 0.27 yr-1, t0 = -0.23 yr. the instantaneous coefficients of natural, total and fishing mortality were estimated as 0.40 yr-1, 0.75 yr-1 and 0.35 yr-1. the results showed that s. trutta fario is moderately a rapidly-growing species in lar dam. the exploitation rate was 0.47. therefore, the population appeared to be in good condition in 2004.