Abstract
To demonstrate whether practical quantities of food fish could be produced in an inexpensive closed system suitable for family-scale use, 424 tilapia hybrid fry weighing a total of 177 g were stocked on 8 May 1981 into a 7600-liter (10·7 m 2) steel-walled, vinyl-lined pool equipped with a rotating biological contactor, a settling basin, supplemental aeration and a passive solar collector. Ammonia, nitrite, nitrate, oxygen, temperature, pH and turbidity were monitored. New water was added at intervals during the experiment, at an average rate equivalent to 4% per day. Floating catfish chow was fed. To establish a growth curve and biomass estimate, 30 fish were removed, weighed and restocked every two weeks. After 146 days of grow-out, 48·6 kg of fish were harvested. Food conversion was 1·25:1. With suitable temperatures, 2·5 crops totaling at least 121 kg could be produced at a rate equal to 121000 kg/ha/yr of water surface.
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