In cage aquaculture technical simplicity with which farms can be established or expanded, lower capital
cost, feeding, growth and health of stocked fishescan be monitored on a daily basis without much
disturbance, cultured species are well and harvesting of cultured species would be easier and costeffective. As caged fish are generally fed with high protein diets, wastes derived from feed are either
directly or indirectly released to the surrounding environment, causing accelerated eutrophication in the
receiving waters (Beveridge, 1984; Ackefors, 1986; Lin, 1990).