Hot temperatures, low stream levels and cloudbursts are the perfect recipe for a fish kill.
“Historically, fish kills occur more frequently under these conditions, and we are very dry here in northwest Iowa,” says Ken Hessenius, supervisor of the Iowa Department of Natural Resources’ (DNR’s) Spencer field office. “We’ve also investigated a few fish kills in other parts of the state this week.
“For that reason, we want to encourage farmers, pesticide and manure applicators and homeowners to be extra careful when using chemicals, fertilizers and manure,” he added.
The dog days of summer, when heat and algal blooms cause oxygen levels to drop, cause fish and other aquatic organisms like crayfish and dragonfly larvae to be especially vulnerable to pollutants.
Anyone who handles chemicals or animal manure can take a few simple precautions to prevent downstream impacts.