WHY is there a largemouth in our lake???

I didn't think our lake had largemouth bass. I released this guy anyway as I wasn't sure, but I suspect someone threw some largemouth into the lake hoping to 'create' a new fishery by introducing another species. Beside the fact that this is ILLEGAL, it can cause serious imbalances, including hurting our smallmouth and lake trout fishery. Please do not throw fish in our lake and try to create your own sports fishing arena - leave it to the experts at the Ministry of Natural Resources.

I caught this Largemouth Bass fishing for smallmouth: