Feeding Your Koi Right

🍽️ The golden rule of koi feeding

When it comes to feeding koi, less is almost always better. Overfeeding is one of the most common mistakes new koi keepers make, and it causes a cascade of problems — uneaten food decomposes and spikes ammonia, excess nutrients fuel algae blooms, and overfed koi can develop liver and digestive issues over time.

The standard guideline is to feed only what your koi can consume within 5 minutes, then remove any uneaten food. In practice, you should see your fish actively competing for food. If food is sinking to the bottom untouched, you're feeding too much.

🌡️ Temperature dictates everything

A koi's metabolism is tied directly to water temperature, which means temperature determines what you feed, how much you feed, and whether you feed at all.

Above 65°F: feed a quality staple or growth food 2–3 times daily. This is when koi grow fastest and build body condition.

55–65°F: switch to a wheat germ based food, which is lower in protein and much easier to digest in cooler water. Feed once daily, small amounts.

50–55°F: feed wheat germ every 2–3 days, very small portions.

Below 50°F: stop feeding entirely. Koi cannot properly digest food at this temperature, and undigested food sitting in their gut over winter can cause serious internal damage and even death.

🥗 Understanding koi food types

Staple food is your everyday feeding option — a balanced pellet designed to meet koi's nutritional needs during normal activity. Look for a protein content of 30–36% from quality sources like fish meal or shrimp meal.

Wheat germ food is lower in protein (around 20–25%) and higher in easily digestible carbohydrates. Essential for spring and autumn feeding when temperatures are cooler.

Growth or color-enhancing foods are higher in protein (38–42%) and often contain color enhancers like spirulina or astaxanthin that bring out orange and red pigments. Best used in summer when koi are actively growing.

Treats and supplements include silkworm pupae, shrimp, watermelon, and orange slices. These are enjoyable enrichment but should not make up more than 10% of their diet.

📅 Seasonal feeding calendar

Spring (water above 50°F, below 65°F): wheat germ food, once daily, small amounts. Gradually increase as temperatures rise. Switch to staple food once consistently above 65°F.

Summer (65°F and above): staple or growth food, 2–3 times daily. Monitor water quality closely as feeding frequency increases.

Autumn (dropping below 65°F): begin transitioning back to wheat germ. Reduce feeding frequency as temperatures drop. By the time you're consistently below 55°F, feed only every 2–3 days.

Winter (below 50°F): no feeding. None. Not even a little.

🚫 Foods to never feed koi

Bread and crackers: high in starch and gluten, which koi cannot properly digest. They expand in the gut and can cause bloating and constipation.

Pork, beef, and most mammal-based meats: koi are not designed to digest mammal fats and proteins.

Citrus fruits: the acidity can irritate koi's digestive systems.

Anything with added salt, seasoning, or preservatives: human-processed foods contain additives that are harmful to fish.

Stick to quality koi-specific foods as your base and offer only known-safe treats in moderation.

🛒 Our recommended koi foods

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Is your water handling the feeding load?

More food means more waste. Check your water chemistry to make sure your pond is keeping up.