More than one hundred fish turned up dead in a southern Kentucky pond and now investigators are trying to figure out how it happened.

Fish and Wildlife officials spent the morning at Levi Jackson State Park in Laurel County.

Several agencies came in this morning to test the water and found it was depleted of oxygen causing problems for the fish. The State Park says this seems to happen every two years. They say there are several factors that contribute to the low oxygen levels, including ducks on the pond.

"They could, yeah. Anytime there's manure in the water bacteria has to decompose that, and that takes up oxygen in the process. So that could be a contributing factor," said John Williams, with the Kentucky Department of Fish & Wildlife.

The park says they've cleaned up most of the dead fish. At this point, officials are weighing their options about how restore oxygen levels to the water.