Open AccessFish meal replacement by soy protein from soymilk in the diets of red sea bream ( Pagrus major )
Author(s) -
Biswas A.,
Araki H.,
Sakata T.,
Nakamori T.,
Kato K.,
Takii K.
Publication year - 2017
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12513
Subject(s) - pagrus major , fish meal , biology , soy protein , phosphorus , meal , zoology , food science , protein efficiency ratio , feed conversion ratio , fish <actinopterygii> , nutrient , juvenile , body weight , fishery , chemistry , ecology , endocrinology , organic chemistry
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.