Foreign species of plants such as grassy arrowhead (Sagittaria graminea) and yellow flags (iris pseudacorus) and freshwater creatures such as bluegills, largemouth bass, alligator snapping turtles and red-eared sliders (Trachemys scripta) are viewed as problematic.
ナガバオモダカ、キショウブなどの植物や、ブルーギルやオオクチバス、ワニガメ、アカミミガメなどの外来種が問題視されている。