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Abstract
The floating fish cage consisted of a PVC pipe flotation frame (4.6 X 9.1m), a solid plastic bag of polyester reinforced polyvinyl plastic (75m3), and an axial flow water pump (1/4 hp gearmotor with 61 cm diameter impeller). Water flow was 7 m3/minute and provided more than 10 exchanges/hour of cage water. During operational tests, the cage performed as expected, although problems occurred with waste accumulations inside the bag, bag collapse from storm waves, and intake screen clogging with macrophytes. Cage construction and installation costs were about $6,000, and electrical costs were $360/year.