How often you feed your koi fish can vary greatly. It usually depends on the season and the temperature of the pond water, plus the specific type of koi fish you have. When the water is warmer—usually around 55℉ and up—koi fish eat a large amount to help them grow. During their growing season, they should be offered food daily. Offer small amounts and stop giving it after 2 to 5 minutes so they don’t overeat.
As the season changes and their water cools, their metabolism will slow, and they’ll need less and less food. Eventually, once the temperature drops below 55℉, they’ll require little to no food until it warms up again.
Be sure to measure the temperature of your pond accurately. Always follow the directions on koi food carefully, and make sure you get the correct feed for your pond temperature. If you have any concerns, consult your vet.