consider of different levels of methionine amino acid on growth indices and whole body composition of juveniles huso huso (bluga)

this experiment was conducted in international researchery institute of sturgeon fishes shahid  dadman. the basal diet contained fish meal as protein source (cp=40%). five diets were supplemented with 5 graded levels of methionine, (0, 0.5,1 ,1.5, 2% met per kg diet) . each diet was randomly assigned to triplicate groups of 195 juvenile huso huso (initial weight 31.9± 2.8) in fiftin 500-l circular fibere glass tanks. fish were fed 4%of their body weight 3 times daily for 8 weeks. after 8 weeks, the analyzsis of growth indises and body composition by one-way analysis of variance (anova) showed that: weight gain, body weight incerease(bwi) specific growth rate)sgr(, feed coversion efficiency (fce), protein efficiency ratio (per), feed efficiency (fe), hepatosomatic index (hsi)  had no significant differences in different levels of methionine (p>0.05).but body composition had significant differences in different levels of methionine( (p<0.05)), especially in treat 4 (methionine 1.5%)(pr =%55.9±.32, fat = %13.3±.3, ash =% 8.4±0.2, moisture =% 66.9±0.7),this result determined the role of essential amino acids on qualitative indices of growth performance in  juveniles cultural huso huso