Using of supplemental lysine, alanine and methionine on growth performance and survival rates in Persian sturgeon (Acipenser persicus) fingerlings

Document Type : Tarvij

Authors

1 Aquaculture Expert

2 Fish Physiology Expert

3 Fish Nutrient Expert

Abstract

A study was conducted to evaluate the effects of dietary supplementation of Methionine, Lysine and Alanine on growth performance, Feed Conversion Ratio (FCR) and survival rates in Persian sturgeon (Acipenser persicus) fingerlings reared under weaning period in Iran for fifty days. Experimental fish were fed ten practical diets supplemented with 0 (as a control diet), 1,2 and 3 % of Methionine, Lysine and Alanine in a design experiment. The experimental groups were fed in triplicate. A total of 3300 A.persicus larvae with an average weight of 0.4 ± 0.09 g (mean ± SD) and an average total length of 3.8 ± 0.29 (mean ± SD) cm were randomly allocated to thirty 50-L aerated tanks (110 fish in each tank) with flow rate of about 0.2 l/min. The results show that when growth of Persian sturgeon juveniles increases, they will need more methionine. The results indicated that there were significant differences in growth performance of all methionine level, the 2 and 3 level of Lysine and Alanine groups. Maximum weight gain (5.9± 1.2 g), special growth rate (5.4± 0.4%) occurred at 3% dietary Alanine. But the survival rates were not significantly affected by dietary amino acids levels and the control groups. Therefore, in order to adaptation of Persian sturgeon larvae, it is suggested to apply at least one, two and three percent of methionine, lysine and alanine in larval diet, respectively.

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