https://nas.er.usgs.gov/AlertSystem/The US Geological Survey’s Nonindigenous Aquatic Species (NAS) Alert system is based on the NAS database (https://nas.er.usgs.gov), a database of locations of introduced aquatic species nationwide. An alert is generated when a species is found in a new state, county, or drainage where it has not previously been recorded. Users can view an archive of past alerts, or register to receive alerts either by e-mail or RSS, at https://nas.er.usgs.gov/AlertSystemen-us60http://vbasic.net/media/logo.gifSun, 05 Apr 2026 20:11:56 GMThttp://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1924643Wednesday, 25 March 2026 00:00:00*Bonus* USGS Nonindigenous Aquatic Species Alert - 03/25/26 - Golden Mussel (Limnoperna fortunei) was found in the Santa Ana Subbasin, Los Angeles County, California. This is the first occurrence for this species in the state.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1924644Wednesday, 25 March 2026 00:00:00*Bonus* USGS Nonindigenous Aquatic Species Alert - 03/25/26 - Golden Mussel (Limnoperna fortunei) was found in the Santa Ana Subbasin, San Bernardino County, California. This is the first occurrence for this species in the state.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1924638Friday, 20 March 2026 00:00:00USGS Nonindigenous Aquatic Species Alert - 03/20/26 - brittle waternymph (Najas minor) was found in the Lower Arkansas Subbasin, Arkansas County, Arkansas. This is the first occurrence for this species in the subbasin and the county.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1924627Monday, 16 March 2026 00:00:00*Bonus* USGS Nonindigenous Aquatic Species Alert - 03/16/26 - Golden Mussel (Limnoperna fortunei) was found in the Santa Ana Subbasin, San Bernardino County, California. This is the first occurrence for this species in the state.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1924620Friday, 13 March 2026 00:00:00USGS Nonindigenous Aquatic Species Alert - 03/13/26 - Round Goby (Neogobius melanostomus) was found in the Upper Mississippi-Cape Girardeau Subbasin, Alexander County, Illinois. This is the first occurrence for this species in the county.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1924606Wednesday, 11 March 2026 00:00:00USGS Nonindigenous Aquatic Species Alert - 03/11/26 - Black Carp (Mylopharyngodon piceus) was found in the Upper Little Subbasin, McCurtain County, Oklahoma. This is the first occurrence for this species in the state.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1897721Friday, 06 March 2026 00:00:00USGS Nonindigenous Aquatic Species Alert - 03/06/26 - Golden Mussel (Limnoperna fortunei) was found in the San Diego Subbasin, San Diego County, California. This is the first occurrence for this species in the subbasin and the county.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1897705Wednesday, 25 February 2026 00:00:00USGS Nonindigenous Aquatic Species Alert - 02/25/26 - sabretoothed blenny (Petroscirtes variabilis) was found in the Hawaii Subbasin, Hawaii County, Hawaii. This is the first occurrence for this species in the country.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1897638Friday, 06 February 2026 00:00:00*Bonus* USGS Nonindigenous Aquatic Species Alert - 02/06/26 - Golden Mussel (Limnoperna fortunei) was found in the Tulare Lake Bed Subbasin, Kern County, California. This is the first occurrence for this species in the state.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1897639Friday, 06 February 2026 00:00:00USGS Nonindigenous Aquatic Species Alert - 02/06/26 - New Zealand mudsnail (Potamopyrgus antipodarum) was found in the Upper Rio Grande Subbasin, Taos County, New Mexico. This is the first occurrence for this species in the subbasin and the county.