I am a Catfish afterall

I am a freshwater fish Some of my kin have grown to ten feet I am shrimpy compared to them I stopped growing at six feet I live in a place with lots of dinner A lake that attracts worms, frogs, and rodents Sometimes I get a duck A duck tastes delightful! I look fierce With those two evil pretend canines hanging from my mouth I am docile though Unless you look like food I am a catfish after all