The western tubenose goby (Proterorhinus semilunaris Heckel, 1837) is expanding its range into the St. Lawrence River: first record in Quebec

The invasive western tubenose goby (Proterorhinus semilunaris) was introduced in the Great Lakes in the 1990s. Since then, its range slowly expanded downstream into Ontario's portion of the St. Lawrence River. This rapid communication reports on the first occurrence of a western tubenose goby found in Lake St. Francis (St. Lawrence River, Quebec) in August 2022. The specimen, the study area and the sampling methodology are described while hypotheses about its presence and expansion are explored.