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.gifFri, 12 Jun 2026 22:14:10 GMThttp://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1886777Wednesday, 19 November 2025 00:00:00USGS Nonindigenous Aquatic Species Alert - 11/19/25 - American lobster (Homarus americanus) was found in the Oneida Subbasin, Oneida County, New York. This is the first occurrence for this species in the state.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1886712Friday, 14 November 2025 00:00:00USGS Nonindigenous Aquatic Species Alert - 11/14/25 - banded mysterysnail (Callinina georgiana) was found in the Lake Champlain Subbasin, Franklin County, Vermont. This is the first occurrence for this species in the county.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1886561Tuesday, 23 September 2025 00:00:00USGS Nonindigenous Aquatic Species Alert - 09/23/25 - spiny waterflea (Bythotrephes longimanus) was found in the Pemigewasset River Subbasin, Grafton County, New Hampshire. This is the first occurrence for this species in the subbasin and the county.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1886559Monday, 22 September 2025 00:00:00USGS Nonindigenous Aquatic Species Alert - 09/22/25 - European frogbit (Hydrocharis morsus-ranae) was found in the Winooski River Subbasin, Washington County, Vermont. This is the first occurrence for this species in the county.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1886396Thursday, 11 September 2025 00:00:00USGS Nonindigenous Aquatic Species Alert - 09/11/25 - Rusty Crayfish (Faxonius rusticus) was found in the Lamoille River Subbasin, Chittenden County, Vermont. This is the first occurrence for this species in the subbasin.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1886400Thursday, 11 September 2025 00:00:00USGS Nonindigenous Aquatic Species Alert - 09/11/25 - banded mysterysnail (Callinina georgiana) was found in the Lamoille River Subbasin, Chittenden County, Vermont. This is the first occurrence for this species in the subbasin and the county.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1886401Thursday, 11 September 2025 00:00:00USGS Nonindigenous Aquatic Species Alert - 09/11/25 - mud bithynia (Bithynia tentaculata) was found in the Lake Champlain Subbasin, Addison County, Vermont. This is the first occurrence for this species in the county.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1884021Tuesday, 22 July 2025 00:00:00USGS Nonindigenous Aquatic Species Alert - 07/22/25 - Rusty Crayfish (Faxonius rusticus) was found in the Lake Champlain Subbasin, Chittenden County, Vermont. This is the first occurrence for this species in the county.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1878082Monday, 07 July 2025 00:00:00USGS Nonindigenous Aquatic Species Alert - 07/07/25 - European frogbit (Hydrocharis morsus-ranae) was found in the Seneca Subbasin, Tompkins County, New York. This is the first occurrence for this species in the county.http://nas.er.usgs.gov/queries/specimenviewer.aspx?SpecimenID=1736863Monday, 29 July 2024 00:00:00USGS Nonindigenous Aquatic Species Alert - 07/29/24 - waterwheel plant (Aldrovanda vesiculosa) was found in the Charles Subbasin, Essex County, Massachusetts. This is the first occurrence for this species in the state.