Montana Fish and Wildlife Conservation Office
Mountain-Prairie Region

Fish Entrainment Investigations in the St. Mary Canal - Blackfeet Indian Reservation, Montana

We conduct detailed investigations of fish entrainment in the Saint Mary Canal. These studies are aimed at estimating the density, species composition, and timing (diel and seasonal) of fish entrained in the canal and determining the efficacy of an electric fish barrier installed at the canal headgates. Entrainment nets installed on the headgates are operated periodically during the irrigation season (April-September). At the end of the season, after the canal headgates are closed and the canal is drained, netting surveys are also conducted in isolated canal pools. Native fish that are encountered are released back into the St. Mary River.

Last updated: March 23, 2011