Journal
AQUACULTURE NUTRITION
Volume 25, Issue 1, Pages 205-214Publisher
WILEY
DOI: 10.1111/anu.12844
Keywords
blunt snout bream (Megalobrama amblycephala); essential amino acids supplementation; extruded feed; fish meal reduction
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Funding
- Modern Agriculture Industrial Technology System special project-the national technology system for Conventional Freshwater Fish Industries [CARS-45]
- Central Public-interest Scientific Institution Basal Research Fund, CAFS [2018HY-ZD0502]
- National Science Foundation [31772820]
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Six extruded diets were formulated with a graded level of fish meal (FM); diet 1 and diet 2 were formulated with 80 g/kg FM; diet 3 and diet 4 were formulated with 40 g/kg FM; and diet 5 and diet 6 were devoid of FM. Hence, diet 2, diet 4 and diet 6 were supplemented with essential amino acids (EAAs). The diets were fed throughout an eight-week feeding trial. The results revealed that specific growth rate (SGR), feed conversion ratio (FCR), body weight gain (BWG) and protein efficiency ratio (PER) were influenced by FM reduction and improved by the addition of EAA (p < 0.05). A survival rate (SR), whole body content of protein, lipid, moisture and ash, and plasma total protein (TP), albumin (ALB), triglyceride (TG) and urea (UN) did not influence by dietary treatments (p > 0.05). Additionally, target of rapamycin (TOR) pathway did not influence by dietary treatments (p > 0.05). Expression levels of hepatic peptide transporter 1 (Pept1) and peptide transporter 2 (Pept2) decreased against FM reduction and improved significantly in the groups fed diet 4 and diet 6. In summary, the findings revealed that diet containing plant proteins mixture supplemented with EAA could totally replace FM in the practical diet of blunt snout bream.
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