Effect of Different Feeding Rates for the Growth and Body Composition of Manchurian Trout, Brachymystax lenok

A 50-day feeding trial was conducted to investigate the e0ects of feeding rates (FRs) on the growth, feed utilisation, and body composition of Brachymystax lenok. Juveniles of B. lenok (initial body weight of 7.6 +/- 0.2 g) were fed a commercial diet at the di0erent FRs of 1, 2, 3, 4, and 5% of their body weight. *e results indicated that weight gain (WG) and speci9c growth rate (SGR) were 9rst increased and then decreased with an increase in the FR. *e WG and SGR of the 4% group were 299.78% and 3.96%, respectively. *e feed conversion ratio (FCR) and protein e 0.05). However, the FR signi9cantly a0ected the hepatosomatic index (HSI) and visceral somatic index (VSI) ( P < 0.05). With an increase in the FR, the moisture content of the 9sh decreased, but the ash content changed irregularly. *e protein content increased signi9cantly with increasing FR (P < 0.05). *e lipid content showed a trend similar to protein in the body. Based on the SGR and FCR data, the optimal FR range was 2.4 to 3.1% for B. lenok (7-30 g body weight) at a water temperature of 16 degrees C.