The team led by Ahmad Daud Om at the Marine Fish Production and Research Centre has developed a low cost and easy to manage recirculation aquaculture system suitable for small hatcheries. They have named this CENTS – Cheap Efficient Nursery Tank System. The system is ideal for nursing the highly carnivorous tiger grouper from 2-3cm to 7.5 - 10 cm total length in seawater of 15ppt. There are two partitioned concrete biological filters, two water pumps, one air blower and 20 concrete tanks holding 180 litres of water. Each of these can hold 2,000 2-3 cm juveniles. The investment cost is MYR 20,000. A unique feature is a waste trap which reduces the load on the biological filters. This is merely lifted for cleaning twice a day. Waterin the tanks and biological filters are topped up by 10-15% daily. Fish is graded every two weeks and stocking density is reduced by transferring fish to nursery tanks. In a one month operation, the yield is 14,000 juveniles. Fish are fed to satiation 4-6 times daily. Pre operation procedures include preparation of probiotic bacteria for tanks and biological filters. The benefits of this system include improvement in survival at 80-90% as compared to juveniles reared in open systems such as cages and ponds. The system has been commercialised and it now used by 20 farmers for nursing of various species of marine fish fry.
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