The Use of Mannan-oligosaccharide (MOS) to the Growth and Survival Rate of Java Eel (Anguilla b. bicolor)

Growth and survival rate are the most crucial in commercial culture as well as feed quality, and it's pricing. This study aimed to obtain the effect of different dose of MOS to the growth and survival rate early big pencil size of shortfin eel Anguilla b. bicolor. Three replications with four treatments of feed containing 0, 0.1, 0.2, and 0.3 % doses of MOS (noted as T₀, T₁, T₂, and T₃) were administered during 84 days culture. The fish were fed with 2.2% wet basis d^-1 of commercial shrimp feed combined with catfish feed. Initial density of approx. 5 kg seed stock of early big pencil eel in 0.4 m³ recirculating water system. The result indicated that absolute, individual and biomass-specific growth rate (SGRi/b) have the similar patterns corresponds to the dose of MOS. The highest SGRi was T₃ (0.69±0.05% d^-1) followed by T₂ (0.60±0.03% d^-1), T₁ (0.46±0.04% d^-1) and T₀ (0.44±0.03% d^-1). Meanwhile the SGRb shows significantly different (α < 0.05) between T₃ (0.66±0.05% d^-1) and T₂ (0.57±0.04% d^-1), but no significantly different (α > 0.05) between T₁ (0.43±0.05% d^-1) and T₀ (0.40±0.02% d^-1), and both of T₃ and T₂ have significantly different (α < 0.01) to T₁ and T₀. The best SR was in T₂ (98.0 %), followed by T₁ (97.5 %), T₃ (97.3 %) and T₃ (96.4 %). Hence, the MOS gave a positive impact on growth and slightly gave a different effect on survival rate.