Emergency Aeration of Fish Ponds

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Abstract
Dissolved O2 (DO) concentrations were depressed in 0.57 ha fish ponds [containing Ictalurus spp.] through algicide treatment and the effectiveness of different techniques of emergency aeration was compared. The most effective device for emergency aeration was a tractor-powered paddlewheel aerator. A tractor-powered Crisafulli pump with a discharge capacity of 18.9 m3/min was also a relatively effective aeration device when used either to spray DO-deficient water into the air and back into the pond or to pump fresh, oxygenated water from another pond into the one with low DO concentration. A lower capacity Rainmaster pump (3.8 m3/min) was much less effective than the Crisafulli pump when used to discharge oxygenated water into a DO-depleted pond. Neither pump raised DO concentrations appreciably when used to circulate DO-deficient water in ponds. Three sizes (0.25, 2.2 and 3.7 kW) of spray-type surface aerators failed to appreciably increase DO concentrations.

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