The suitable dose of gamma irradiation on soybean meal as a fish meal substitute in diets for golden pompano (Trachinotus ovatus)

Abstract

A 5‐week feeding trial was conducted to assess the effect of gamma ray irradiation treatment on soybean meal as a fish meal substitute in diets for golden pompano (Trachinotus ovatus). A diet containing 32% fish meal served as a reference (C), and 75% of the fish meal was replaced by soybean meal that either received no gamma ray irradiation (R0) or was irradiated with gamma ray at a dose of 5 (R5), 10 (R10), 15 (R15), 30 (R30) or 60 (R60) kGy respectively. All the diets were formulated to contain 46% crude protein and 6.5% crude lipid. The weight gain was higher in fish fed diets R5, R10, R15 and R30 than in fish fed diet R0. The feed intake was higher in fish fed diets R15, R30 and R60 than in fish fed diets R0, R5 and R10. No significant differences were found in feed conversion ratio, nitrogen retention efficiency, condition factor, hepatosomatic index, body composition, waste outputs of nitrogen and phosphorus between fish fed the diets with non‐irradiated soybean meal or irradiated soybean meal as the fish meal substitute. Proteins with heavy molecular weight in soybean meal were degraded, whereas the contents of proteins with light molecular weight or peptides increased with the increase in the irradiation dose. This study reveals that gamma ray irradiation at a dose of 5 to 15 kGy can significantly improve the level of soybean meal inclusion as a fish meal substitute in diets for golden pompano.

Replacing fish meal with a blend of poultry by-product meal and feather meal in diets for giant croaker (Nibea japonica)

“…Deficiency of some essential amino acids, such as Met and Lys, has been recognized as one of the factors limiting dietary fish meal replacement with terrestrial animal and plant ingredients (Glencross, Booth, & Allan, ). In some studies, however, supplementation of crystalline Met and Lys could not increase the level of fish meal replacement with soybean meal in diets for Japanese sea bass and golden pompano (Wu, Ren, Qin, Han, & Wang, ; Zhang et al., ). Wang et al.…”

Improvement of fish meal replacements by soybean meal and soy protein concentrate in golden pompano diet through γ-ray irradiation

“…Wu et al . () reported that γ‐ray irradiation on SBM can significantly improve the growth of golden pompano fed a diet with fish meal replaced by SBM. In the present study, weight gain was higher in fish fed diets SM30 or SC30 than in fish fed diets SM or SC.…”

“…Wu et al . () considered that the mechanisms for enhanced SBM inclusion in fish diet after γ‐ray irradiation might be due to the inactivation of undesirable proteins. The SDS‐PAGE electrophoretion indicated that the level of the protein subunits with molecular weight >6.5 kDa in SBM and SPC declined after γ‐ray irradiation.…”

“…() and Wu et al . () reported that the level of SBM inclusion in the diets of Japanese sea bass Lateolabrax japonicus and golden pompano can be significantly increased by pre‐γ‐ray irradiation on the dietary ingredient. This finding sheds light on the necessity to further explore whether γ‐ray irradiation can improve the level of inclusion for soybean products in fish diets.…”

Utilization of electron beam irradiated Jatropha kernel meal in the diet ofLabeo rohita(Hamilton, 1822) fingerlings

“…Also, Wu et al. () reported that no significant differences were found in the HSI between the golden pompano ( Trachinotus ovatus ) fish fed fish meal (FM)‐based control diet and diet where 75% FM was replaced by irradiated (15 kGy) SBM. Lower HSI and ISI values exhibited by the fish of T15 and T20 groups might be due to the effect of PEs and phytic acid as reported by Kumar, Makkar, Amselgruber, et al.…”