Effects of Gracilaria verrucosa, Enteromorpha prolifera, algae residue and fungi residue on growth performance, and related biochemical indices of juvenile Takifugu rubripes

Abstract:

This study investigated the effects of dietary fish meal replacement by seaweeds or residues on growth performance and related biochemical indices of juvenile tiger puffer (Takifugu rubripes), with 2 fishmeal diets containing 60% and 45% fishmeal as the control 1, and the control 2, and other four diets with 30% fishmeal replaced by 10% four kinds of seaweeds or residues (Gracilaria verrucosa, Enteromorpha prolifera, Algae residue, Fungi residue) and vegetables protein(wheat gluten, corn gluten meal, and soybean meal), and they were named as C1, C2, JL, HT, ZZ, and JZ. Each diet was fed to three replicates of 25 tiger puffers with initial body weight of (17.33±0.55) g for 56 d. The results showed as follows: The special growth ratio (SGR) of HT group were significantly higher than that of other groups (P<0.05). The SGR of ZZ group was significantly higher than C2 and JL groups (P<0.05). The feed efficiency ratio (FER) of C1 and HT groups were significantly higher than C2 and JZ groups (P<0.05). The protein productive value (PPV) and protein efficiency ratio (PER) of C1 were significantly higher than C2 and JZ groups (P<0.05). No significant differences were found in activities of serum glutamic pyruvic transaminase (GPT), serum glutamic oxalacetic transaminase (GOT), liver GPT and liver GOT (P>0.05). No significant differences were found in activity of serum superoxide dismutase (SOD) and content of malondialdehyde (MDA). Crude protein content of whole body in JZ group was significantly higher than ZZ group (P<0.05). And crude lipid contents in whole body in HT and ZZ groups were significantly higher than C2 group (P<0.05). Above results showed that replaced 30% fish meal with 10% G. verrucosa, E. prolifera, algae residue or fungi residue and vegetable proteins have no adverse effect on the growth performance of juvenile tiger puffer, and E. prolifera can significantly improve the growth performance.