Where in the US is the sea lamprey found?

The sea lamprey is primarily found in the Great Lakes region of the United States, particularly in areas like Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario. They are also present in some river systems connected to these lakes, such as the St. Lawrence River and various tributaries. Originally from the Atlantic Ocean, sea lampreys have invaded these freshwater ecosystems, where they are considered an invasive species.