Effect of feed enriched with fermented coconut water products on growth and carcass composition of gurami sago (Osphronemus goramy Lacepède, 1801) juvenile.

Abstract

Background Giant gourami (Osphronemus goramy Lacepede, 1801) is a popular freshwater species in Indonesia, but there is limited information on feed used for its cultivation. Therefore, this study aims to determine effect of feed enriched with fermented coconut water and palm sap sugar solution on growth, feed efficiency, and carcass composition of juvenile sago gurami. Methods A total of 2 litres coconut water and 1litres palm sap sugar solution (10%) were formulated. Each formulated product was then mixed with 6 g Aspergillus niger (P1), 6 g Rhizopus oligosporus (P2), and 6 g Saccharomyces cerevisiae (P3) to obtain the supplements. Subsequently, supplementation was carried out on commercial feed at a dose of 300 ml/kg of feed. Samples supplemented with P1, P2, and P3 were designated P1, P2, and P3 diets, while feed added to freshwater was considered P4 (placebo). Gurami sago juvenile (initial weight 50±2.5 g and length 13.2±0.4 cm) were then placed in triplicate nets (2×1×1 m) in a freshwater concrete pond with a stocking density of 30 fish/net. Results The different products formulations had a significant effect (p<0.05) on growth performance. The weight gain in P1, P2, P3, and P4 diets were 167.24%, 193.99%, 134,22%, and 115.98%, respectively. For feed conversion efficiency, the values obtained were 0.65, 0.73, 0.65, and 0.64 in P1, P2, P3, and P4, respectively. Furthermore, supplementing commercial feed with varying products formulation had a significant impact (p<0.05) on the fatty acid composition and carcass body of gurami sago. Lipid content in fish carcass fed P1, P2, P3, and P4 were 2.90%, 4.42%, 2.98%, and 2.76%, respectively. Conclusion Based on the results, P2 contained a higher concentration of fatty acids compared to other diets, leading to increased body weight, feed efficiency, and carcass fatty acid composition in sago gurami reared in freshwater concrete ponds.