generally you can put whatever type of fish you want in a pond as long as they can make it thur a cool winter..... so that will limit alot of tropicals out.... but any fish that in ponds around you area in the wild you can have in your pond..... Your in TN so I would look locally for a club or even a person who build ponds for a living, they generally will give you helpful info.

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Gold Coast Aquarium Society South Florida
www.goldcoastaquarium.org