What Fish should I use in my Aquaponics Garden?

What fish you use in your indoor aquaponics garden depends on if you intend to harvest the fish or not.  If you intend to harvest your fish for food, tilapia are a great choice.  They grow quickly, are a high-density fish (meaning you can have many fish in smaller amounts of water), and reproduce rapidly.

If you don't intend to harvest your fish for food, you can simply use gold fish.  Gold fish are very dirty fish, so few will feed several plants in an aquaponic garden.  I have found that just 2 gold fish will feed a 2'x4' flood tray with lettuce, parsley, lemon balm, and watercress all growing green and great with no pH problems at all.  If you have too many fish in your aquaponics system, nitrate levels will increase and the pH as well.