A koi’s natural environment provides a variety of food sources that meet all the dietary requirements they need to grow and be healthy. Ornamental ponds, however, do not meet all of these requirements through pond food sources alone. For this reason, it is important to learn how to properly feed your koi to ensure they are receiving all the nutrients they need to thrive.

You can feed koi almost anything people can eat. This includes shrimp, fruit, vegetables, and anything that isn’t high in carbohydrates. Bread and foods like that are hard on your fish’s stomachs. You can also feed them fish food pellets. Make sure they’re the right size. Feed them over a 5 minute period.

If you have an ecosystem pond you’ll only want to feed your fish a handful of food twice per week. Anymore and they can start having health problems.

If you don’t have plants you can feed koi fish as much as they can eat in 5 minutes once per day. Fish don’t have the ability to tell when they’re full so they won’t stop eating as long as there’s food to be had.. The best time to feed your fish is when the pond water is between 50-degrees and 85-degrees Fahrenheit because outside of this range they can’t digest very well. During winter they hibernate so please do not feed them.

Also, get food pellets appropriate for the size of your fish. A better-suited size means your fish can digest more efficiently, making for healthier fish that can grow to their proper size.

What Koi Fish Eat Naturally

In the wild, koi fish eat algae, plants, insects, worms, seeds, and anything they can stir up from the pond’s bottom. They hunt along the pond floor and along the surface. If you have an ecosystem pond they can continue having their natural diet. This means feeding time is simply a way to bond and have fun with your fish.

There Are 4 Main Foods People Feed Koi Fish:

1. Spirulina Algae

Spirulina Algae tablets are good to feed koi fish

These blue-green algae, also called cyanobacterium, live in water and make their own food. They’re very small, only growing up to half a millimeter in length. This algae is free-floating and can be found in lakes with an extremely high pH and very hard water.

Feed koi fish spirulina algae for these benefits:

Higher growth rate

Improving digestion

Boosting the immune system

Helping prevent swollen abdomens

Enhancing the production of special enzymes that break down fats into energ

Bringing out better coloration due to carotene pigments found in the algae.

2. Wheat Germ

Don’t worry it’s not the bad kind of germ. This is the part of wheat that sprouts and grows into a new plant, the wheat seed if you will. Experiments have shown wheat germ can help goldfish and koi grow faster. It’s also a natural source of vitamin E which improves blood circulation, increases oxygen and nutrient flow, helps promote balanced growth, and aids in fighting off disease.

3. Brine Shrimp

Brine shrimp filter water and feed fish

Here’s a fancy science word for you: bio-enrichment. Brine shrimp filter water by eating anything in it they can, which isn’t much due to their small size. The nutrients they eat pass on to the fish they are eaten by, which is the process known as bio-enrichment. Brine shrimp are especially good for feeding recently hatched koi fish.

4. Fish Food

Small and baby koi prefer flake fish food, the smallest form. Pellets are good for the average-size koi while larger koi prefer bars of fish food. Most have plenty of proteins, a small number of fats, and essential vitamins & nutrients.

Some other favourites include worms, larvae, tadpoles, shrimp, and clams.

What Not To Feed Koi Fish

Don’t feed koi fish anything high in carbs. You should also avoid feeding them white bread, peas, and corn. Koi fish have a hard time digesting carbs.

Don’t feed them anything you catch in the wild either. This includes fish, bugs, frogs, and everything else. They could have parasites or diseases.

Grains aren’t the best food for koi. They tend to be very fattening, which is good if your fish start losing weight. If you decide to feed them pasta or rice you’ll need to cook them without salt first. Otherwise, the food could expand inside your koi.

Of course, these foods should not be the basis for their diet. They have little nutritional value for koi.

How To Feed Koi Fish

Cut up any larger foods into bite-sized pieces. Toss one handful into the pond. Let the koi eat as much as you can see before the next handful. Any food left in the pond needs removing. This way it doesn’t break down and lower the water quality.

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