Spawning time, fecundity, fertilization rate, and egg size of brown trout (Salmo trutta fario) reared in north-eastern Turkey were investigated. Seventeen females were stripped into separate bowls and eggs were fertilized by milt from at least two males. Spawning lasted from mid-November to early January. The mean brood size was 989.4 +/- 620.53 g and mean total and relative fecundities were 2029 +/- 2051 eggs/individual and 2259 +/- 947 eggs/kg body weight, respectively. Mean egg diameters and weights were 5.3 +/- 0.40 mm and 93.9 +/- 19.37 mg. The mean fertilization and hatching rates were 95.4 +/- 4.60% and 83.3 +/- 11.79% of the total number of eggs. Correlations were positive between body weight and total (r(2) = 0.8665, p<0.001) and relative (r(2) = 0.1632, p>0.10) fecundity, and negative between egg diameter and body weight (r(2) = -0.002, p>0.10) and total fecundity (r(2) = -0.0865, p>0.05). Our findings suggest that reproductive parameters of brown trout under culture conditions in north-eastern Turkey are similar to those of other salmonid species.