Effects of varying levels of dietary protein and energy on the growth, food performance and body composition of Sobeity (Sparidentex hasta) juvenile
2017
Ghofleh Marammazi, J. | Najafabadi, M. | Pagheh, E. | Hafezieh, M.
This study was carried out to evaluate the effect of varying dietary levels of protein (45%, 50%, 55% and 60%) and energy (20, 22 and 24 kjg^-1) on the growth, survival rate, food performance and body chemical composition of sobaity Juvenile. 36, 300 Lit polyethylene containers equipped with a flow-through water system (with 1 Lit/min water exchange) were provided and each stocked with 18 Juvenile fish (27.99 ± 0.14 g weight). During the rearing period, a biometric measurement was carried out once fortnightly. After a 56-day rearing period, results showed the significant effect of the treatments (the interaction between protein and energy) and the varying levels of protein and energy on the growth and food performance, survival rate and body composition) P≤0.05) of the fish, but the effect of the dietary protein was not significant on the FCR, PER, fat and body crude fiber (P>0.05). Also, the effect of dietary energy was not significantly effective (P> 0.05) on the growth and food performances, but was significantly effective on the survival rate and body composition) P≤0.05) of the fish. Results also showed the highest amount of growth of the fish in the diet with 60% CP and 24 kJg^-1 energy, the highest survival rate in the diet with 55% CP and 22kJg^-1 energy and the best FCR and PER in the diet with 50% CP and 24 kJg^-1 energy. According to the results of the present study, 50% CP and 22 kJg^-1 energy are recommendable to cover the dietary protein and energy requirements of sobaity fish in the Juvenile stage.
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