Fish meal replacement by soy protein from soymilk in the diets of red sea bream (Pagrus major) |
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| Authors: | A Biswas H Araki T Sakata T Nakamori K Kato K Takii |
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| Institution: | 1. Aquaculture Research Institute, Uragami Station, Kindai University, Uragami, Wakayama, Japan;2. Fuji Oil Company Ltd., Izumisano, Osaka, Japan;3. Aquaculture Research Institute, Shirahama Station, Kindai University, Shirahama, Wakayama, Japan |
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| Abstract: | 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. |
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| Keywords: | antinutritional factors fish meal replacement growth performance phosphorus discharge red sea bream soymilk protein |
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