BEREA -- Investigators from state and local agencies are trying to find out what has killed thousands of fish on the Rocky River.
The fish kill involves a three to five mile stretch on the river between Berea and Middleburg Heights.
The Environmental Protection Agency, Ohio Division of Wildlife and the Cleveland Metroparks are all involved in the investigation.
The fish kill comes during the spawning season and could have impact throughout the year for anglers.
The area involved includes both breeding grounds for steelhead trout and small mouth bass.