Effects of different dietary protein and lipids levels on growth performance and digestive enzymes of the rabbitfish (Siganus rivulatus), reared in well water

El-Sayed Salem Et Al., Mohamed

doi:10.21608/ejabf.2021.205026

Effects of different dietary protein and lipids levels on growth performance and digestive enzymes of the rabbitfish (Siganus rivulatus), reared in well water

Document Type : Original Article

Author

Mohamed El-Sayed Salem et al.

10.21608/ejabf.2021.205026

Abstract

A trial has been evaluated the effects of different levels of dietary protein and lipid on the growth performance, feed utilization, and digestive enzymes of the rabbitfish (Siganus rivulatus). Four diets were formulated as follows: diet 1 (P30L6) (protein 30% and lipid 6%), diet 2 (P30L12) (protein 30% and lipid 12%), diet 3 (P40L6) (protein 40% and lipid 6%) and diet 4 (P40L12) (protein 40% and lipid 12%). Diets were fed to the Rabbitfish (S. rivulatus) juveniles (0.32 ± 0.16 g /fish) for 56 days. Fish fed on P40L12 and P40L6 diets showed the best growth, followed by P30L6 and P30L12. Better feed utilization was obtained in fish-fed diets with 40% protein compared to 30% protein regardless of the dietary lipid levels. The highest value of protease has been recorded in P40 fish groups with both lipid levels followed by P30L12. Fish groups of P30L6, P30L12, P40L6 to P40L12, respectively, showed an increase in lipase upward. The highest result of amylase was detected in P30L6 followed by P30L6 and P40L6. The highest value of glutamate dehydrogenase was given in P30L6 followed by P30L12. Thus, the P40L6 diet is suitable for the optimal growth performance and digestion functions of the Rabbitfish (S. rivulatus) juveniles.

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