People are asked to be vigilant after a small amount of water chestnut, an aggressive, aquatic invasive species, was found in the Chautauqua Lake outlet.

The discovery was made on Aug. 10 about one mile upriver from the McCrea Point Park Boat launch on the descending right bank of the outlet.

A volunteer found one water chestnut plant while a group was examining dense stands of native water lily.

It comes about a week after Western New York Partnership for Regional Invasive Species Management (WNY PRISM) workers removed “2 very full grocery bags" of the species in the Chautauqua Lake Outlet on Aug. 2.

Anyone who sees water chestnut on Chautuauqua Lake is asked to report it to the Roger Tory Peterson Institute at 716-665-2473 or WNY PRISM at 716-878-4708.