OMAHA, Neb. (AP) — The U.S. Army Corps of Engineers says a recent water sample shows the presence of invasive zebra mussel larva in west Omaha’s Lake Zorinsky.

The corps says the larvae are microscopic, and that there is no indication that they are a threat to the dam’s infrastructure.

There are no immediate plans to lower Lake Zorinsky or use any chemicals to treat the lake for zebra mussels.

The small black-and-white striped mussels, native to eastern Europe, are voracious eaters, gobbling up plankton that many native freshwater fish need to survive.

The mussels can also attach themselves to boat motors, bait buckets and dam mechanisms, causing damage to motors and facilities.