The occurrence of white spot disease has severely affected many tiger shrimp farms to the extent that some farmers have either ceased operations or switched over to banana shrimp (Penaeus merguiensis/Penaeus indicus) culture.The closed recirculatory system is seen to be an alternate method of tiger shrimp culture whereby incidence of disease can be minimised and also rendering shrimp culture to be environmental friendly with clean water discharge from ponds.Total dependance on the natural water supply for daily water exchange in the culture ponds is kept to a minimum unless extreme changes in water quality make it really necessary.Water initially pumped into the culture ponds is reused after passing through a physical and biological process of biofiltration.The physical process involves sedimentation to remove solid wastes and settleable organic matter. In the biological process green mussel (Perna viridis) or oyster (Crassostrea sp.) are used to remove excess plankton and fine organic matter whereas seaweed (Gracillaria sp.) is used to utilise dissolved nutrients in the water being recirculated. In a closed recirculatory system, 30% of the culture pond area has to be set aside for the purpose of biofiltration.