According to the Associated Press:

Officials at a state park in eastern Kentucky are restricting some activities like swimming and feeding the ducks because of water contamination.

The contamination at Levi Jackson State Park has killed several fish. According to John Williams of the Kentucky Department of Fish and Wildlife, the fish kill was caused by excess nutrients in the water, like cow manure washing into streams.

The water’s oxygen levels are well below average and high temperatures and low water levels are complicating the problem.

Park Manager Carol Kirby said the park will probably stop selling duck food to reduce the amount of nutrients in the water. Park officials are also considering a hiatus on corn grinding at the mill in the park to allow the water level to rise.