Prolly gonna start with perch till I figure out what I am doing - My buddy in CO uses passive solar to heat the water tanks in order to help heat the greenhouse - and I am going to try something similar... I will probably still need a coal/wood stove in it for the bitter cold, but I am not going to get year-round anyhoo. Most likely going to have to shut it down in January, which is fine, as I can get my starts going in late feb that way... Production is pretty grim late winter around here anyway.
I have a friend who keeps one. Breeding pair in a large aquarium inside. Some up north do trout also.