Scientists are puzzling over what caused hundreds of fish to die in Lake Owasso, a popular Minneapolis area fishing lake, last November.
Around Thanksgiving time, local fisherman and residents began noticing large quantities of dead fish turning up frozen in the lake and on the lake’s surface. So far, nobody has been able to figure out why or how it happened.
The Minnesota Department of Natural Resources has ruled out most of the usual suspects: chemical and sewage spills, foul play, fertilizer treatment, and lack of oxygen.
The latter would seem the most obvious, as the lake is frozen over, but state DNR officials say the ice is clear and letting in plenty of sunlight.
DNR officials are now suggesting that the lake might have had too much oxygen, which could have suffocated the fish.
Fertilizer treatment runoff was another popular theory, but DNR officials said they stopped treating areas around the lake last August, and no residual chemicals have turned up in the lake.
Either way, the jury is still out on this mysterious occurrence.
Lake Owasso is a popular fishing spot for its plentiful supply of Walleye, Muskie and Sunfish.
Why do you think the fish died? Let us know in the comments section below.