One inch of fish per 3 gallons of water for comets and goldfish, and 5 gallons of water per Koi fish, is acceptable for most garden ponds.
About this Author
Sandra Ketcham is a writer with more than 15 years experience writing and editing for both print and online publications. She specializes in health, travel and parenting topics, and has articles published in regional, national and international print magazines, including "The Dollar Stretcher" and "Kraze." Ketcham is currently pursuing a degree in psychology.