Free Fish Stocking Calculator - Koi & Goldfish Count | Pond Calculator
Free fish stocking calculator. Calculate maximum fish count for your pond based on volume and species. Supports koi, goldfish, and general fish.
How to Use the Fish Stocking Calculator
Select pond volume and fish type to calculate maximum fish count. Guidelines: koi need 250 gal/fish, goldfish 50 gal/fish, and general fish 50 gal/fish.
Advanced filtration can increase capacity by about 50%. However, overstocking leads to poor water quality and disease.
Quarantine new fish for 2-4 weeks before introducing them to your pond.
FAQ
How many koi can I keep in a 1,000-gallon pond?
The standard guideline is 250 gallons per koi, so a 1,000-gallon pond can support 4 koi. However, this assumes excellent filtration. With advanced filtration, you might keep 5–6 koi, but water quality must be monitored closely.
Can I mix koi and goldfish in the same pond?
Yes, koi and goldfish coexist well. However, koi grow much larger (up to 3 feet) and will eventually outcompete goldfish for food. Ensure the pond is large enough for adult koi (minimum 1,000 gallons) and monitor feeding carefully.
What is the 'inch per gallon' rule for pond fish?
The traditional rule is 1 inch of fish per 10 gallons of water. However, this is a rough guideline. Koi grow to 24–36 inches, so a 24-inch koi needs 240 gallons by this rule. The 250 gallons/koi rule is more practical for adult fish.
How do I introduce new fish to my pond safely?
Quarantine new fish for 2–4 weeks in a separate tank before adding them to your pond. This prevents introducing diseases. When adding to the pond, float the bag for 15–20 minutes to equalize temperature, then slowly mix pond water into the bag before releasing.
What are signs of an overstocked pond?
Signs include: fish gasping at the surface (low oxygen), cloudy or green water, high ammonia/nitrite readings, fish showing stress behaviors, frequent disease outbreaks, and algae blooms. If you see these signs, reduce stocking or upgrade filtration immediately.