The main problem in crab hatchery units is the low survival and growth of crab larvae in the zoea to megalopa stages. The high death rate of crab larvae in the zoea stage is thought to be due to inadequate nutrition and an environment that is not supportive for the development of the next stage. The low survival rate of small crablets is due to high cannibalism and an environment that is not supportive for their life. In order to overcome the problem of low survival and growth in small crab larvae and crablets by maintaining the SI BLUE SOLITARY model. This system is expected to become a model for overcoming cannibalism, competition for food between individuals and maintaining water quality when rearing crab larvae and crablets.
The activity was carried out at the Takalar Brackish Water Aquaculture Fisheries Center. The activity stages include: Preparation of containers, Design of SOLITER SI BLUE , rearing of crab larvae, maintenance of Crablet in SOLITER SI BLUE.
The results of the activity showed that zoea survival was 60%, megalopa stage 27% and crablet 12%. The absolute growth of zoea larvae was obtained respectively at 0.01, megalopa 0.07, Crablet 0.15 g and the development of the Zoea to Megalopa larvae stage lasted for 8-10 days. Then the Megalopa to Crablet stage takes 5-6 days. Crablet survival in SOLITER SI BLUE was obtained at 96.54%. The daily weight growth rate was 0.08%/day, carapace width 0.09%/day and carapace length 0.06%/day.
The impact on crablet rearing at SOLITER SI BLUE is to make the process of crablet seed production easier and more efficient, increase the survival and growth of crablets, provide quality seeds ready to be stocked for rearing and restocking in nature and improve the welfare of the crab cultivator community.