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, 26 Apr 2026 21:52:58 GMThttp://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1932694Tuesday, 07 April 2026 00:00:00USGS Nonindigenous Aquatic Species Alert - 04/07/26 - Red Swamp Crayfish (Procambarus clarkii) was found in the Lower Missouri-Crooked Subbasin, Jackson County, Missouri. This is the first occurrence for this species in the subbasin and the county.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=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=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.