Assessing the Effects of Dietary Inclusion of Hydrolyzed Soy Protein on the Growth, Nutrient Retention, Body Composition, and Serum Hormone of Juvenile Starry Flounder, Platichthys stellatus

Abstract

Enzymatic hydrolysis of soy protein has the potential to be an excellent protein source in marine fish feeds. Here we assessed the effects of different inclusion levels of hydrolyzed soy protein (HSP) on growth performance, nutrient retention, body composition, and serum hormone levels in juvenile starry flounder to define HSP utilization. Five isoenergetic and isoprotein diets were formulated with 0 (control), 10, 20, 30, and 40% HSP (SP10-40) to replace 0, 25, 50, 75, and 100% soy protein concentrate (SPC), respectively. At the end of the feeding trial, fish fed diets SP20 and SP30 had significantly increased weight gain, percent weight gain, and feed efficiency (FE) compared with fish fed the control diet (P < 0.05). Diets SP20 and SP30 supported significantly higher levels of protein retention, and diet SP20 significantly increased energy retention (P < 0.05) in the fish offered these diets. In terms of nutritional composition of whole fish, feeding diets SP20 and SP30 increased crude protein content (P < 0.05) and diets SP10, SP20, and SP30 increased ash content (P < 0.05). Fish fed diets SP20 and SP30 had higher serum insulin-like growth factor 1 (IGF-1) level than that of the control treatment (P < 0.05). When SPC was included at 40% of the diet, 20-30% HSP (43% soluble nitrogen) is recommended to replace 50-75% SPC for maximal growth performance and FE of starry flounder.

Fish meal replaced by hydrolysed soybean meal in diets increases growth and improves the antioxidant defense system of silver catfish ( Rhamdia quelen )

“…The inclusion of a 27% of soybean and cotton hydrolysate mixture to replace fishmeal in Scophthalmus maximus diets increased the protein efficiency ratio (Song et al, 2018). Furthermore, enzymatic hydrolysis increases protein retention, which reduces environmental pollution caused by nitrogen compounds (Fang et al, 2017;Song et al, 2018;Song, Wang, Qiao, Zhang, & Li, 2016).…”

Casein hydrolysate supplementation in low‐crude protein diets increases feed intake and nitrogen retention without affecting nitrogen utilization of growing pigs

“…These findings point to the important role of dietary peptides in appetite regulation. Previous reports also showed that the supplementation of peptides from hydrolyzed porcine mucosa, shrimp hydrolysate, and hydrolyzed soy protein increased the growth performance of broilers, sea breams, and starry flounders, respectively. These results demonstrated that among dietary N forms, peptides are critical for increasing feed intake and body weight gain.…”

Global Aquaculture 2050

“…While already a diverse food production sector, the ongoing research on aquaculture of many new species will likely result in even greater numbers of aquatic species in commercial production by 2050. Recent examples in the Journal of the World Aquaculture Society ( JWAS ) on culture techniques for species that are newer candidates for commercial production include: seahorses (Martínez‐Cardenas and Purser ; Qin et al ; Wang et al ), knifejaw (Biswas and Takii ), Chu's croaker (Huang et al ), crappie (Culpepper and Allen ), peppermint shrimp (Calvo et al ), spotted ivory shell (Lü et al ), painted river prawn (Gomes et al ), rabbitfish (Pham and Le ), and starry and southern flounder (Hu et al ; Song et al ).…”