2024-Jun-04
Evidence Flathead Catfish Have Moved Into Ontario Waters
Scientists have found evidence that the flathead catfish, a voracious species from the southern U.S., is now spawning in Ontario’s Thames River. Over six years, researchers netted 11 catfish from the lower Thames River near Tilbury, including two juveniles. The sighting of juveniles in Canada strongly indicates that reproduction is occurring.
Flathead catfish are already established in the Great Lakes basin, but, until recently, have stayed on the American side off Lake Erie. Researchers think their recent movement north may be the result of warming waters or a move to avoid overpopulation.
A 2023 posting to iNaturalist shows the fish has moved up the Thames River and into the London area.
Flathead catfish are a fierce predator wherever they are found and their large appetities may now mean trouble for vulnerable species in Canadian waters.
Read more here.