National Exotic Marine and Estuarine Species Information System (SERC)
http://invasions.si.edu/nemesis/index.html

Ballast Water: Smithsonian Environmental Research Center
http://invasions.si.edu/nbic/submit.html

United States Geological Survey: Nonindigenous Aquatic Species (NAS) Information Resource
http://nas.er.usgs.gov/

International Nonindigenous Species Database Network
http://www.nisbase.org/nisbase/index.jsp

Oregon Invasive Species Public Map
http://www.imapinvasives.org/orimi/map/