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Blacksaddled coral grouper Plectropomus laevis is an export commodity and possess high economic value in Asian markets, but the wild population is already threatened. The purpose of this study was to determine the best food for improv ing growth and survival rate. The nursering were conducted using 9 fiberglass tanks with 1 m 3 of volume for 6 month, with three treatment and 3 replicates. Three different foods were used as treatments, i.e.: Local com m ersial pellet with crude protein content 50% (A), im-port  com m ersial pellet with cure protein content 55% (B) and trash fish (sardine) (C). The initial size o f blacksaddled coral grouper seed were 2.5 cm total lengths (TL), 0.45 g body weight (BW). The stocking density of fry was reared at 250 fish per m 3 . A complete random design was used as an experiment design. Data was analysed using ANOVA statistics. Feeding times were twice a day at 08.00 and 15.00 local time; wit h dose at satiation. The samplings of fry were conducted every 15 day to measure of survival rate (SR), TL and BW. On the end of experiment was calculated economic ana-lized (BC ratio). The result show ed that there was significant different (P<0.05) among trea t ments for SR and growth rate (GR) . The better SR and GR was at treatment B with SR 96.5%, and GR 0.75g/day followed by treatment C (SR 90.5%: GR 0.54g/day) and treatment A (SR 81.5%: GR 0.42g/ day. The food conversion ratio was 1.15 in treatment A, 1.02 in B and 4.81 (wet weight) in C. From economic analized showed that the best BC ratio was in pellet 55% protein (B), followed by trash fish (C) and pellet 50% protein (A) with BC ratio of 1.75, 1.72 and 1.41 respectively.

APPLICATION OF ARTIFICIAL FEED WITH DIFFERENT PROTEIN CONTENT ON BLACKSADDLED CORAL GROUPER Plectropomus laevis NURSERY