Lovén (opossum shrimp)

Habitat: Deep, cold oligotrophic lakes; has been reported from brackish and estuarine waters.
Life History: Can reach 20 mm and live for 2 years; breed in the winter; adults carry young in a brood pouch until fully developed in the spring; sexually mature at 12-14 mm.
Native Range: Circumpolar in North America (including the Great Lakes) and Europe (including Scandinavia and northern Russia).
Nonindigenous Range: Moosehead Lake in Maine; probably more widespread than reported.
Impacts: May contribute to extinction of native zooplankton communities.
Comments: Introduced into lakes as food for gamefish.