Growth rate of the male red and black nile tilapia in intensive culture pond

English. Growth rate, mortality and food efficiency of the male red and black nile tilapia were tested in 12 concrete tanks of 2 x 5 m at the Balitkanwar experimental station at Cijeruk, Bogor. Red and black nile tilapia of 28.1 g individual weight were stocked at 30 fish/square m and were fed pellet (28 percent crude protein) at 2 percent of body weight per day and fine rice bran (12.5 percent crude protein) at 5 percent of body weight per day; the amount of food were adjusted to the body weight every two weeks. Body weight, number of fish and water quality were checked every two weeks. ANOVA and least significant different statistical analysis showed that the growth rate of the red nile tilapia was better compared to the black nile tilapia, the daily growth rate of red and black nile tilapia being 1.48 percent and 1.38 percent for the fish fed pellet and 0.85 percent and 0.79 percent for the fish fed fine rice bran. Survival rates of the black nile tilapia was better than that of the red nile tilapia. Survival rate of the black nile tilapia and red nile tilapia fed with pellet were 93 percent and 90 percent respectively while that of the fish fed fine rice bran were 93 percent and 87 percent, respectively. The feed efficiency of pellet and fine rice bran for the red nile tilapia and black nile tilapia were 61 percent, 55 percent, 14 percent and 12 percent respectively

unknown. Uji banding pertumbuhan, mortalitas dan efisiensi pakan antara ikan nila merah dan nila hitam jantan dilakukan dalam 12 buah bak beton 2 x 5 m di Instalasi Kolam Percobaan Balitkanwar Cijeruk Bogor. Ikan uji berukuran rata-rata 28,1 g/ekor dipelihara dalam kepadatan 30 ekor/m persegi, diberi pakan buatan yang mengandung protein sekitar 28 persen sebanyak 2 persen berat badan per hari atau dedak halus (12,5 persen protein) sebanyak 5 persen berat badan per hari, jumlah pakan disesuaikan dengan berat badan setiap dua minggu. Hasil menunjukkan bahwa pertumbuhan ikan nila merah lebih baik dibanding dengan nila hitam masing-masing 1,48 persen/ekor/hari dan 1,38 persen/ekor/hari untuk yang diberi pakan pelet dan 0,85 persen/ekor/hari dan 0,79 persen/ekor/hari untuk yang diberi dedak halus. Derajat kelangsungan hidup ikan nila hitam lebih baik dibanding dengan nila merah yaitu 93 persen dan 90 persen untuk yang diberi pakan pelet dan 93 persen dan 87 persen untuk yang diberi dedak halus. Efisiensi penggunaan pakan pelet maupun dedak halus dari nila merah sama dengan nila hitam masing-masing 61 persen dan 14 persen untuk nila merah dan 55 persen dan 12 persen untuk nila hitam, pertumbuhan ikan nila yang diberi pakan pelet jauh lebih cepat dibanding dengan pakan dedak halus