Growth performances and nutrient utilization efficiency of GIFT tilapia reared in floating net cages fed with bioprocessed silkworm pupae meal
2021
Sathishkumar, Govindharaj | Felix, Nathan | Prabu, Elangovan
A 60‐day growth trial was conducted in floating cages to examine the effects of growth performances and nutrient utilization efficiency in Genetically Improved Farmed Tilapia (GIFT) tilapia fed silkworm pupae meal (SWP) and bioprocessed silkworm pupae meal (BSWP) replacing dietary fish meal protein. Seven isonitrogenous (320 g/kg crude protein) isolipidic (50 g/kg crude lipid) and isoenergetic (17 MJ/kg) experimental diets were formulated replacing fish meal protein with 0, 333.3, 666.7 and 1000 g/kg of SWP and BSWP, respectively, and referred as control, SWP 33.33, SWP 66.67, SWP 100, BSWP 33.33, BSWP 66.67 and BSWP 100. Triplicate groups of 30 GIFT tilapia juveniles with an average initial weight of 11.34 ± 0.16 g were fed with experimental diets daily thrice until apparent satiation. Among SWP and BSWP dietary groups, although weight gain was significantly (p < .05) higher in SWP 66.67, BSWP 66.67 and BSWP 100, the feed conversion ratio and specific growth rate were significantly (p < .05) higher in BSWP 66.67 than other diets including control diet. Dietary inclusion of SWP and BSWP does not (p > .05) affect the whole‐body chemical and amino acid composition and haemato‐biochemical responses in GIFT tilapia. It is concluded that non‐processed SWP and bioprocessed SWP can completely replace dietary fish meal protein in GIFT tilapia diets. However, bioprocessed SWP at 666.7 g/kg recorded best growth performance among the diets.
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