Yes. Man-made agriculture-related infrastructure that ultimately becomes a fish habitat.... It was likely never a fish habitat, in a lot of these cases.
There's a well-documented case out of southern Saskatchewan on the Prairie farm rehabilitation administration and the creation of the Newton reservoir, which was completed in 1938. That dam was specifically to irrigate forage and cereal crops and to get things going again after the dirty thirties. We have been witnessing some issues in the past four years, with DFO officials coming in and seemingly arbitrarily reducing the level of water to keep fish from coming into the irrigation canal. It's worrying, at the very least, for a lot of the ranchers and farmers in that area.