Seed production and culture of Orange spotted grouper Epinephelus coioides

Adult fishes (2-3 kg) collected from commercial catches are stocked in a circular tank of 125 m3 capacity fitted with a Re-circulating Aquaculture system (RAS). The tank is connected with different components of RAS such as rapid sand filter to remove suspended solids, protein skimmer to eliminate dissolved solids and biological filter to reduce biochemical waste. The whole tank water is getting recirculated around 300% per day, and the water is added at the rate of 3% to top up the loss happening due to protein skimmer and backwashes of rapid sand filter.