Hydrolyzate protein tuna (Thunnus sp.) viscera as an alternative material for catfish (clarias gariepinus) feed formula

The purposes of this research were to determine the best dosage of the hydrolysate protein tuna viscera powder substitution based on its survival rate, specific growth rate, the conversion ratio and protein efficiency ratio of Catfish (C. gariepinus) fish feed. The fish feed test formula contained 30% of raw protein. The tested fish feed consisted of fish powder mixed with substitution powder from hydrolysate protein tuna viscera. Th e substitution in fish feed A=(0%), B=(30%), C=(60%), and D=(90%). The number of Catfish (C. gariepinus) thrown into 50x30x30 cm aquarium was 35 fish with average weight 1,35-1,46 g. Fish feeding frequency was 4% two times a day at 08:00and 16:00, for 30 days. The results showed that with the added hydrolysate protein tuna viscera protein powder substitution dosage until 50% of the f ish feed, the survival rate improved reaching 92,38%, the best specific growth rate was at 2,71 BB/day feed conversion ratio at 1,91 and the protein efficiency ratio 2,87.