Utilization of Wastewater for Intensive Fish Culture

摘要

Channel catfish were reared in 0.8 cu m cages in a southern Michigan farm pond and a pond which received secondary treated domestic wastewater. Cages were stocked in May with 117 mm fingerlings at densities of 50, 100 and 150 fish per cubic meter. The fish production in the farm pond was approximately 44.8 kg/cu m compared with 12.5 kg/cu m in the wastewater pond. The lower production in the wastewater pond was probably due to adverse water quality conditions including high pH, low dissolved oxygen and high concentrations of unionized ammonia. The results indicate that cage culture is not suitable in highly enriched wastewater ponds with extensive plant growth but successful cage culture may be practiced in southern Michigan farm ponds.