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Fish meal replacement by soy protein from soymilk in the diets of red sea bream (Pagrus major)
- Biswas, A., Araki, H., Sakata, T., Nakamori, T., Kato, K., Takii, K.
- Aquaculture nutrition 2017 v.23 no.6 pp. 1379-1389
- Pagrus major, body weight, condition factor, feed conversion, fish, fish meal, juveniles, phosphorus, satiety, soy protein concentrate, soy protein isolate, soymilk, specific growth rate, tanks
- Six isoenergetic diets were formulated as follows: fish meal (FM) 700 g kg–¹ (control, C), FM 300 g kg–¹ + soy protein concentrate 300 g kg–¹ (SPC), FM 300 g kg–¹ + enzyme‐treated SPC 300 g kg–¹ (ESC), FM 170 g kg–¹ + soy protein isolate 300 g kg–¹ (SPI), FM 160 g kg–¹ + enzyme‐treated SPI 300 g kg–¹ (ESI) and FM 150 g kg–¹ + conglycinin 300 g kg–¹(CG). Forty fish (3.9 g) were randomly distributed into each of eighteen 300‐L tanks, fed twice daily until satiation for 8 weeks. The final body weight, specific growth rate and condition factor did not show significant differences among the fish fed with diets C, SPC, ESC and ESI (p > .05). The survival was significantly lower in fish fed with diets SPI and CG. Feed efficiency was significantly higher in fish fed with diets SPC and C than in fish fed with other diets (p < .05). There were no significant differences in nutrients retention efficiencies in fish fed with diets C, SPC, ESC and ESI. A significantly higher phosphorus retention efficiency in fish fed with soymilk protein diets resulted in lower phosphorus discharge to the environment (p < .05). These results suggest that the soymilk proteins can comfortably replace 570–770 g FM kg–¹ diet of red sea bream juvenile, which will ensure significant ecological benefits through reducing phosphorus load to the environment.