Jane L. Dangeubun, Abdul M. Serang, Diana Y. Syahailatua
Abstract. This study aims to determine the growth rate of rabbitfish Siganus guttatus, snapper Lates calcarifer, tiger grouper Mycteroperca tigris and humpback grouper Cromileptes altivelis using artificial feed enriched with Alstonia acuminata. It was carried out in seawater of Kelanit village, southeast Mallucas district. This experiment used fish with a total length of 13-14 cm (35-37 g) for C. altivelis, 11- 12 cm (32-34 g) for S. guttatus, 14-15 cm (43-45 g) for M. tigris, and 21-23 cm (127-130 g) for L. calcarifer, respectively. Experimental fish were kept in floating net cages with 100 individuals of each species. The feed used was pellet feed with the addition of A. acuminata plant which was given twice a day as much as 5% of the fish biomass. The experimental design used was a randomized block design with 3 replications for 60 days of observation. Each species was stocked at a density of 25 ind plot-1 , so that there were 16 experimental units. The results showed that there were significant differences between the treatment of fish species by using A. acuminata in absolute growth, daily growth rate, daily feed consumption, feed efficiency and feed conversion ratio. The highest absolute growth, daily growth rate, feed efficiency, and the lowest feed conversion ratio were achieved in the treatment of L. calcarifer species.
Key Words: consumption rate, feed conversion, S. guttatus, L. calcarifer, M. tigris, C. altivelis.