Weather and natural causes are being blamed for more than 500 fish found dead in a lake earlier this week.
Indiana Department of Resources officials say the fish likely died because of a phenomenon called a lake turnover.
DNR Conservation Officer Lt. Angela Goldman says turnover occurs when a shallow body of water, like a small pond or lake, has been warmed by hot summer temperatures and is hit by cold rain.
“And what that does is completely deplete the oxygen level in the water,” Goldman says. “And it can result in a fish kill, just like what happened there.”
Goldman says lake turnover isn’t common, and it’s unlikely to occur in larger bodies of water. But it is reported several times a year, usually in late summer.
Hundreds of fish were also found dead at a retention pond at a golf course in Indianapolis this week. Marion County Health Department spokesperson Curt Brantingham says the water quality department investigated, and they saw no signs of a spill or release into the pond.
Brantingham says the department believes the fish died from either lake turnover or the application of algaecide, which prevents algae from growing in the lake. But since there was no threat to public health, the department did not determine an exact cause.