In a smaller sized tank, <50 gallons of water, we recommend stocking the tank with 1″ of fish for every 1 gallon of water.  For example, a 10-gallon tank could hold 10x 1″ fish or 5x 2″ fish.

For larger fish in tanks over 50 gallons, we recommend a stocking density of 1 lb of fish per 5 -10 gallons of water, or 1-2 fish per 10 gallons of water. Do not stock more than 1 pound of fish for every three gallons of water, this will greatly increase the potential for fish stress, fish diseases, and an overall imbalance of your aquaponic system.