Effects of Supplemental Lysine and Methionine on Growth Performance and Survival Rates of Persian Sturgeon (Acipenser persicus) Fingerlings

The Current study was conducted to evaluate the effects of dietary supplementation of lysine and/or methionine on growth performance and survival rates in Persian sturgeon (Acipenser persicus) fingerlings reared under culture conditions in Iran for fifty days from 15 June 2011 to 6 August 2011. Experimental fish were fed five practical diets supplemented with 0 (as a control diet)، 1 and 3 % of lysine and methionine in a 2×2 factorial design experiment. The experimental groups were fed in triplicate. A total of 360 A. persicus fingerlings with an average weight of 1. 8 ± 0. 3 g (mean±SD) and an average total length of 7. 1 ± 2 (mean±SD) cm were randomly allocated to eighteen 50-L aerated tanks (20 fish in each tank) with flow rate of about 0. 2 l/min. The results indicated that there were significant differences in growth performance among treatment. Maximum weight gain (10. 1± 2. 5 g)، body weight increase (461. 9±138. 6 %) and special growth rate (10. 7± 0. 7%) occurred at 3% dietary methionine and lysine. But the survival rates were not significantly affected by dietary lysine and methionine levels.