Chlorella vulgaris is a green alga rich in nutrients. Research on supplementing the alga into the fish feed (4 g/kg) fed discontinuously to gourami (Osphronemus gouramy Lac.) was conducted. The purposes of this study were to determine the body composition of gourami discontinuously fed with C. vulgaris supplement, and to obtain the best treatment to the fish body composition. Twenty-four fish were separated into four treatment groups, with three replicates. These consisted of control, daily fed fish (C), once a week fasted fish (P1), twice a week fasted fish (P2), and three times a week fasted fish (P3). The study was conducted experimentally for 56 days. Data on body composition were measured at the end of the study. The results showed that the feeding of C. vulgaris supplement of 4 g/kg feed could improve the gourami body composition. The fish that fasted for two days a week demonstrated the best body composition. The success of gourami cultivation is mostly determined by the feed given to increase the nutritional value of the body. Thus, in the cultivation, gouramy should be fed with C. vulgaris supplement of 4 g/kg of feed and fasted two days a week.

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