CHATTANOOGA, Tenn. (AP) — Tennessee officials are investigating what caused tens of thousands of dead and dying fish in a small creek near the Tennessee River.

The Chattanooga Times Free Press reports Chattanooga officials and Tennessee Valley Authority biologists believe weather may be to blame. Chattanooga Public Works Administrator Justin Holland said in a statement that officials think recent water temperature increases and above-normal rainfall levels may be related to the cause.

TWRA biologist Bobby Brown determined there are two types of dead fish in and around the creek, gizzard shad and threadfin shad.

The Tennessee Wildlife Resources Agency is leading the investigation, but the Tennessee Department of Environment and Conservation Division of Water Resources staff also plans to investigate.

The fish were discovered Wednesday, and the investigation began Thursday.

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Information from: Chattanooga Times Free Press, http://www.timesfreepress.com