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EL RENO, Okla. – Authorities are investigating what caused hundreds of fish to die at El Reno Lake this weekend.

William McCormack has lived in El Reno all his life, and he goes to the lake often.

He said this weekend something was different.

“I came out to test my boat. I’ve been working on it, and I noticed there was fish just floating everywhere,” McCormack said.

It wasn’t just one or two but hundreds of fish.

McCormack sais he’s never seen anything like it.

“I’ve never seen fish kill out here. I mean, it’s got a pretty good flow through and, even the years before when the lake was low, you’d think that’s when they’d have it, but it wasn’t, and the lake’s full right now,” McCormack said.

Authorities believe the extreme heat has been taking away the oxygen in the water, and that could be the reason for the fish kill.

However, McCormack isn’t so sure.

“It’s been that way every summer. This summer has been cooler than most, so I kind of wonder about that,” McCormack said.

He’s got his own theories of what the cause could be.

“They’ve sunk a lot of green trees. There were fresh cut trees in the lake to attract fish and, then, last Sunday or last weekend, they had the smoke on the water jet boat races here. I don’t know if the fuel dissipated in the water and caused it or whether it’s an algae kill,” McCormack said.

McCormack posted the pictures of the fish to his Facebook page on Saturday, and the posts reached over 2,000 people.

Soon enough, the fire department was alerted.

“They just saw my Facebook post and came out and started picking up some fish. I guess, they’re going to send them off and have them analyzed, see what was wrong with them,” McCormack said.

No word yet on what the official cause is.

We will update you once that information is available.