Koi Food: How to Choose the Right Pellet (and When It Matters)

Walk into any pond store and you’ll face a wall of koi food at wildly different prices. The label vocabulary is simple once decoded.

The four types that matter

Growth formula (summer). 35–40% protein, usually fish-meal based. This is the workhorse food for water above 68°F, when koi metabolize fast enough to turn protein into body mass. If you’re growing juveniles toward jumbo size, this plus warm water is how it happens.

Wheat germ formula (spring/fall). Lower protein, highly digestible. The right choice below ~60°F when digestion slows; feeding summer food in cool water stresses the fish. See what koi eat for the full temperature table.

Color-enhancing formula. Adds carotenoid sources — spirulina, krill, shrimp meal — that deepen red and orange pigment over weeks. Worth it for pattern varieties like Kohaku and Showa; alternate it with a staple food, since heavy use can tint white ground yellowish.

All-season staple. Moderate protein, fine for established ponds in mild climates. If you feed one food year-round in a temperate state, make it this — but you’ll get better growth and color from seasonal switching.

Reading the label like a dealer

• First ingredient should be a named protein (fish meal, krill), not wheat
• Protein %: 35–40 for growth, high-20s to low-30s otherwise
• Floating pellets let you watch the fish eat (and spot appetite loss early — a health signal)
• Pellet size: small enough for your smallest fish; big koi handle any size

What the professionals feed

Ask any serious dealer what they feed and you’ll get a specific answer, often a mixed regimen — staple plus color food plus seasonal treats like silkworm pupae. It’s a fair question to ask before buying from anyone on the dealer directory, because the food a young koi was raised on shows up in its condition at sale time — and in its price.