Construction technology on RAS for shrimp culture

The paper is focused on the construction technology of an economical recirculating aquaculture systems used for raising shrimp (Lieopenaeus vanamei) with microalgae. Original water used for the system was sea water, which would be oxygenated in the pond outside. Culture density was 500 spieces/m2. By the culture test, an economical mode was developed. In the early period, blower was used for aeration to supply the oxygen demand and the water was not reused. In the middle period, after about 15 days, all the water treatment devices were started and the water was fully reused. In the last period, oxygenation was added into the system. During the culture period, about 90 days, average dissolved oxygen concentration in the water was about 5.1 mg/L, TAN concentration changed between 0.002-0.15 mg/L, pH 7.62-8.29. The cultural test has obtained a good result, final shrimp output in the cultural tank were about 4.6 kg/m2, and the cost was very low. For raising 1 kg shrimp, 1 000 L water and 2.16 kW·h electricity was cost.