Author(s): Ahmad Daud Om, Nik Haiha Nik Yusoff and Zainoddin Jamari

Abstract: The use of recirculating aquaculture systems (RAS) is an alternative to the marine fish hatchery system in the country. However, the technology originated from overseas are relatively high cost and is found to be unsuitable for use to certain extent. It requires modifications in accordance with local requirements. To date, there is no fully developed RAS system using local technology that can be applied in marine fish nurseries. Therefore, RAS system with a concept of backyard technology, its believed more reliable to be developed for the use of local operators, as it is less expensive compared to technology purchased from abroad. Study was undertaken to improve marine fry nursing system by using recirculating aquaculture system technology for practical advantages. This RAS system is named as CENTS-RAS 2.0 system that consists with installation on 20 units of 300 liters concrete tank each for a total capacity of 6000 liters per module. System was testing using hybrid grouper with the stocking rate at 1000 pieces / tank which is in total of 20,000 seeds for the complete set of the module. Fish with Initial size 5.0±0.68 cm of total length were reared for 50 days. The survival rate was 91.5% with total length was 10.25±2.5 cm and 25.5±2.18 g. A separate flow-through system was used as a control with same module size. The total production or biomass production (kg/ton) is 70.07 kg per m³ compare to CENTS-FT which is only 18.75 kg per m³. The optimum return on the density of 20,000 seeds with 49% IRR indicator, ROI 64%, and break-even point of 139,650 tails at production cost of RM 3.44 per tails. This finding study defines what is requirement for optimum condition of marine seeds nursing system in RAS.

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