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. Learn more about fish stocking density in our blog, “Aquaponic Fish Production and Stocking Densities”.