Evaluation of soy protein concentrate as a substitute for fishmeal in diets for juvenile starry flounder (Platichthys stellatus)

摘要: Abstract Fishmeal replacement with soy protein hydrolysate in diets for juvenile starry flounder (Platichthys stellatus) has been reported recently, but its application is limited due to high price and low yield. Whether it feasible replace dietary fishmeal (FMP) cheap concentrate (SPC) this fish remains uncertain. A feeding trial was conducted investigate the effect of containing SPC on growth performance, oxidation resistance, health status, feed digestion nutritional composition flounder. Six isonitrogenous isolipidic were formulated 0% (S0, control), 20% (S20), 40% (S40), 60% (S60), 80% (S80) 100% (S100) FMP. Each diet randomly assigned triplicate tanks 80 (initial weight 12.76 ± 0.2 g) per tank a circulating water system. Fish fed twice daily apparent satiation 10 weeks. At end trial, gain, specific rate, intake survival rate lower S80 S100 than other treatments. Feed efficiency ratio, ratio condition factor reduced by total FMP compared control. The maximum gain estimated be 54.86–59.02% using broken-line models. Moreover, serum lysozyme superoxide dismutase activities decreased S60, versus S0, while aspartate aminotransferase, alanine transaminase gamma-glutamyl transferase followed reverse trend. Lower glutathione peroxidase corresponded higher alkaline phosphatase activity S0. Serum albumin contents (S100), whereas cholesterol low- high-density lipoprotein any Pepsin trypsin stomach, foregut hindgut increased S40 S100. Amylase elevated replacing at least SPC, that SPC. Additionally, fat ash content whole These results indicated could utilized effectively less recommended satisfactory health. Statement relevance Our work proved replaced Present paper assesses feasibility provided basis formulation low-fishmeal flatfish aquaculture.