September 2, 2014

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Winterkill: Are your fish alive?
Wednesday, February 26, 2014 8:35 AM

By Mark Holtsberry

Education specialist Paulding SWCD

Winterkill in ponds occur as a result of a massive decline in oxygen during a long period of ice cover. But as long as the pond is open or partially open, oxygen levels remain high, according to William E. Lynch Jr. Extension Associate Aquatic Ecosystem Management Ohio State University.

This is because diffusion of oxygen from the air and wind agitation add more oxygen to the water than what is used for animal metabolism and plant disposition. This is even true for those very sheltered ponds that receive very little exposure to the wind.