Illegal Fish Introductions

In many areas of the country, and northwestern Montana in particular, non-native fish are moved from lake-to-lake by “bucket biologists.” This unsanctioned, illegal movement of fishes causes considerable harm to lake’s native species. With Sam Bourret of Montana Fish, Wildlife & Parks, I have been analyzing records of illegal introductions in an effort to determine which waterbodies are most at risk of future illegal introductions and help managers identify how they can be prevented.

Distribution of NW Montana lakes with illegal introductions (white) and without (grey).

Related publications:

Clancy, N. G. and S. L. Bourret. In review. Using social and physical variables to assess vulnerability of northwestern Montana lakes to illegal fish introductions.

Bourret, S. L. and Clancy, N. G. 2018. Using forensic geochemistry via fish otoliths to investigate an illegal fish introduction. Canadian Journal of Fisheries and Aquatic Sciences.