Fishmeal can be completely replaced by soy protein concentrate by increasing feeding frequency in Nile tilapia (Oreochromis niloticus GIFT strain) less than 2 g

An 8 week growth trial was conducted to determine the effects of complete replacement of fishmeal protein by soy protein concentrate (SPC) on growth performance of Nile tilapia (Oreochromis niloticus GIFT strain) fry (initial body weight 1 6 0 0 g) In control diet, 135 g kg I fishmeal was used and in the other two diets 100% of fishmeal was replaced by SPC supplemented with or without methionine hydroxy analogue (MHA) according to the content in FM diet Fish of FM group were fed twice daily Fish of SPC6 group were fed SPC diet six times daily Fish of SPCM group were fed twice (SPCM2) or six times (SPCM6) daily The results showed that complete replacement of fishmeal with SPC did not affect survival condition factor, visceralsomatic index of Nile tilapia Feed intake (FI) and feed conversion ratio (FCR) of fish in SPCM2 and SPC6 groups were higher than those in FM and SPCM6 groups Specific growth rate (SGR) of fish in SPCM6 group was highest among four treatments Productive protein value (PPV) of SPCM2 and SPC6 groups were significantly lower than that of FM group Fishmeal could be completely replaced by SPC without negative effect on growth by MHA supplementation and increasing feeding frequenc