The invasive spiny water flea has found its way to Lake George.
Researchers say Lake George is the latest New York waterway contaminated with the creature, which competes with fish for food.
The state Department of Conservation says an angler at the north end of the lake pulled in a batch of fleas last week. Samples taken Tuesday confirmed the pest living off Mallory Island, near the northeast shore.
A task force of New York and Vermont authorities is working to stem the spread of the flea, which feeds on small crustaceans and plankton. Boaters and fisherman are being told to decontaminate their gear before entering area waters.
Vermont Senator Patrick Leahy called for closing parts of the Champlain Canal to protect Lake Champlain, a move rejected by New York officials.