Jimbo, you can keep fish in an aquarium but your size would be quite limited if you want to have healthy fish. In a 100 gal tank more than 1 or 2 1 - 2 lb fish would be the limit based on my experience. Alternately, you could have 20 - 40 2" fish, such as baby bluegills or bass. They are quite pretty and fun to watch and easy to feed with freeze dried foods. You have to have excellent filtration and aeration and monitor the water chemistry to prevent unpleasant surprises. I like to keep small Bluegills and Bass in a tank but find that rotating them back to the pond after a few months is the best idea for me. I don't know much about Walleyes but I wonder whether temperature could be a problem, aquariums tend to get warm. Muskies would seem to be a fools errand if you ask me.
Jim
