| Specimen ID | State | County | Locality | Year | HUC Number | Drainage Name | Status |
| 39542 | NY | | Lake Ontario | 1947 | 04280002 | Lake Ontario | established |
| 39610 | NY | | Lake Ontario | 1955 | 04280002 | Lake Ontario | established |
| 39646 | NY | | Lake Ontario | 1985 | 04280002 | Lake Ontario | established |
| 39541 | NY | | Lake Ontario | 1929 | 04280002 | Lake Ontario | established |
| 39419 | NY | | Lake Ontario | 1980 | 04280002 | Lake Ontario | established |
| 39592 | NY | | Lake Ontario | 1980 | 04280002 | Lake Ontario | established |
| 1649752 | NY | Monroe | | 2016 | 04280002 | Lake Ontario | established |
| 1651223 | NY | Monroe | North Hamlin | 2018 | 04280002 | Lake Ontario | established |
| 1651224 | NY | Oswego | Oswego | 2018 | 04280002 | Lake Ontario | established |
| 1653855 | NY | Jefferson | Henderson, NY 13650, USA | 2019 | 04280002 | Lake Ontario | established |
| 1878269 | NY | Cayuga | Lake Ontario | 2018 | 04280002 | Lake Ontario | established |
| 1878272 | NY | Monroe | Lake Ontario | 2019 | 04280002 | Lake Ontario | established |
| 1884306 | NY | Monroe | North Hamlin, Lake Ontario | 2018 | 04280002 | Lake Ontario | established |
| 1884309 | NY | Cayuga | Oswego, Lake Ontario | 2018 | 04280002 | Lake Ontario | established |
| 1907637 | NY | Monroe | Lake Ontario, at Rochester, NY | 2017 | 04280002 | Lake Ontario | |
| 1909046 | NY | Monroe | Lake Ontario, at Rochester, NY | 2017 | 04280002 | Lake Ontario | |
| 1907797 | NY | Niagara | Lake Ontario, at Lower Niagara River, NY/ON | 2012 | 04280002 | Lake Ontario | |
| 1908123 | NY | Monroe | Lake Ontario, at Rochester, NY | 2015 | 04280002 | Lake Ontario | |
| 1909159 | NY | Monroe | Lake Ontario, at Rochester, NY | 2019 | 04280002 | Lake Ontario | |
Citation for this information:
U.S. Geological Survey, 2026,
Osmerus mordax: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov, Access Date: 6/4/2026