Abstract
AbstractA management system, replacing emergency aeration practices with gentle pond circulation, has been employed over an entire catfish growing season. Five waterblenders were used to provide pond circulation for a 1.42 ha catfish pond stocked at a density of nearly 10,000 finger‐lings/ha. Pond water circulation during the daytime hours mixed oxygen‐rich surface waters with the deeper oxygen‐poor waters. The waterblending operation continued long enough after dark to decrease the thermal gradients, so that the diurnal temperature change provided top‐to‐bottom mixing on most nights during the season.Comparisons of yield data, power requirements, and oxygen and temperature profiles show the advantages of the pond receiving water circulation over a neighboring pond that was aerated only on an emergency basis. Comparisons of waterblending with recent aeration studies of other investigators show an order of magnitude reduction in energy uses.
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