Effect of L-carnitine food additive on growth indices and body composition of Caspian Sea Kutum (Rutilus firsii kutum)

In this research for evaluate the effect of L- Carnitine on growth and body composition in Caspian Sea Kutum (Rutilus firsii kutum), an experiment with 240 pieces of fish (means weight 13.21 ± 2.5) was done during 70 days. Fish were randomly allocated in 12 tanks (20 fish per tank) The L-Carnitin level of diets was 500, 1000 and 2000 mgkg-1 of diet. Fish were fed of the three levels of L-carnitine with 7 percent body weight (3 times a day).The different level of L-Carnitine did not have a significant effect on body weight gain, the percent of body weight gain, specific growth rate, overweight rate and the percent of ash (P> 0.05) but, had a significant effect on percent of protein and lipid among different treatment (P<0.05). As the result, the different level of L-Carnitine did not have a significant effect on Caspian Sea Kutum growth but had effect on roach carrion quality.