The Arlington Heights Park District is investigating why hundreds of dead fish washed up Sunday on the shores of Lake Arlington.
Park District officials said they are still cleaning up the hundreds of Gizzard Shad found dead at the lake over the weekend.
According to a news release, the park district is in contact with the Department of Natural Resources about the issue.
Common reasons for fish die-off include drought, algae bloom, overpopulation or a sustained increase in water temperature, officials said.
The boathouse at Lake Arlington will remain open during the clean up.