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Effluents from Catfish Ponds during Fish Harvest¹

ABSTRACT

Samples of effluents from eight channel catfish (Ictalurus punctatus) ponds at Auburn, Ala., collected during fish harvest were analyzed for BOD, COD, settleable matter, soluble orthophosphate, total phosphorus, total ammonia, and nitrate.

Settleable matter concentrations, for which 3.3 ml/liter has been suggested as the instantaneous maximum for effluents from fish ponds, ranged from 0 to 1.2 ml/liter during the draining phase when 95% of water was discharged. Water discharged during seining to remove fish usually contained > 3.3 ml/liter settleable matter (range 0.5 to 100 ml/liter).

Concentrations of other potential pollutants, except nitrate, also increased during the seining phase. However, even effluents discharged during the draining phase had higher levels of most measured parameters than first-order streams draining forested or agricultural watersheds in the vicinity.

Key Words: water quality • Ictalurus punctatus • fish culture • aquaculture • fish farming

¹ Research supported by Hatch Proj. Alabama no. 398.

² Professor, Dep. of Fisheries and Allied Aquacultures, Auburn Univ., Auburn, AL 36830.

Received for publication March 11, 1977.