<![CDATA[Feed efficiency and mineral adequacy to support molting and growth are major challenges in the cultivation of mud crab (Scylla serrata). This study aimed to evaluate the effect of supplementing maggot meal (Hermetia illucens) and gonggong shell meal in feed formulations on molting frequency, growth performance, and survival rate of mud crabs. The experiment was conducted using a Completely Randomized Design (CRD) consisting of three treatments: A (control—trash fish), B (feed + 5% maggot meal + 1% gonggong shell meal), and C (feed + 10% maggot meal + 3% gonggong shell meal), each with five replications. The crabs were reared for 30 days and fed daily at 5% of the total biomass. Parameters observed included absolute weight gain, specific growth rate (SGR), molting frequency, survival rate, proximate composition of the feed, and water quality. The results showed that treatment C produced the highest growth performance (absolute weight gain of 39.00 g; SGR 1.30%/day) compared to treatment B (18.00 g; 0.60%/day) and A (6.60 g; 0.22%/day). Proximate analysis indicated an increase in protein (36.42%) and ash content (12.35%) in the formulation containing gonggong shell meal. The survival rate remained high across treatments (A = 100%, B = 87%, C = 93%), while no individuals underwent molting during the study period. In conclusion, the supplementation of 10% maggot meal and 3% gonggong shell meal effectively improved the growth performance of S. serrata but was not sufficient to stimulate molting.]]>
