GROWTH OF NILE TILAPIA (Oreochormis niloticus) FRY FED WITH COCONUT TESTA-CASSAVA BAGASSE MIXED SUBSTRATE FERMENTED USING Rhizopus oryzae
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Abstract
Utilization of agroindustrial byproduct as cheap raw materials for aquafeed was hampered by its poor nutritional value as well as high antinutrition content which could be overcome through fermentation. Coconut testa (CT) and cassava bagasse (CB) were mixed, and fermented using Rhizopus oryzae for preparing aquafeed. Subsequent feeding test was carried out on tilapias (Oreochormis niloticus L.) using 5 feeding treatments: one unfermented feed (commercial feed 100%), and the other four feeds produced by fermentation using substrate mixture of CT and CB in 4 different ratios, namely 100%:0%, 75%:25%, 50%:50%, and 25%:75%. Feeding 100% commercial feed (true protein 22.64% and crude fibre 14.67%) showed the best results on the fish growth with body weight gain of 3.96 g and feed conversion ratio of 8.63. Meanwhile, feeding fermented feeds (true protein 7.96-20.27% and crude fiber 14.14-18.47%) resulted in body weight gain in the range of 2.22 to 2.75 g with feed conversion ratio of 10.89 to 13.62. Thus, the fermented feeds promoted growth in tested tilapias albeit less optimally than commercial feed did.
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