Do Koi Fish Eat Duckweed? Is It ok For Them To Eat

Are you planning on adding edible plants to your koi fish pond? Do you think duckweed is the best choice for you? Will your koi fish eat duckweed when you add it to their tank? Let’s find out more about duckweed and koi fish in this article.

Duckweed is one of the favorite food sources of koi fish. They so much love duckweed that they can make their most meals out of it, reducing the amount of food you give to them. If you have too many koi fish in the pond, they will eat all the duckweed and still request additional food.

Do Koi Fish Eat Duckweed

How Much Duckweed Should a Koi Fish Eat?

Koi fish will ingest as many duckweeds as they can eat. When they eat to their fill, they will leave it, and come back to it when they feel hungry again. Duckweed is one of the best foods for koi as they will keep on eating it.

Koi fish do not have a limit to the amount of duckweed they can eat. They will only stop eating when they get their stomach filled. You have to make sure you control the amount of duckweed they eat and give them other foods to maintain a balanced diet.

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Is Duckweed Bad for a Koi to Eat?

Duckweed is not a bad food for koi as it is highly nutritious for them. Duckweed is not only nutritious to koi but also provides other benefits. Duckweed is an efficient natural filter that will help you absorb every bad material from your pond water.

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It also helps give shade to the pond giving your pond a good environment. It can also serve as cover for your koi, protecting it from predators.

Is Duckweed Good for a Koi to Eat?

Duckweed is one of the best foods for koi fish. Koi fish take delight in eating this food and will do so whenever they come across it. Duckweed also provides nutritional benefits to koi fish.

Duckweed increases the level of dissolved oxygen in the water providing enough oxygen for your fish. The dissolved oxygen also helps in stemming the dangerous effect of ammonia. It can also reduce the level of microalgae as well as solids suspended.

What Fish Eat Duckweed?

Not only koi eat duckweed; other fish eat duckweed. This fish is the grass carp. Koi and the grass carp are the most common species of duckweed. Grass carp do feed on duckweeds but not as much as koi does.

Other fish that will eat duckweed include

  • Catfish
  • Tilapia
  • Goldfish
  • Domesticated Waterfowl
  • Cichlids
  • and most other small fish species

What Animals Eat Duckweed?

Aside from fishes, other animals also feed on duckweeds. Some of the animals include;

  • Birds : Several birds feed on duckweeds. Some species of these birds tend to stop eating duckweed as they grow older and move to other food types. Some other birds’ species start their taste with insects and other food but move on to duckweeds. Birds that eat duckweed include wood ducks, mallards, and Canadian geese.
  • Amphibians : Amphibians are also one of the few animal groups that feed on duckweeds. Some are mostly omnivores and feed on a wide variety of organisms.
  • Insects : There are also types of insects that do not feed on meat or blood; they feed on duckweed vegetables. You will see these insects by the stem and leaves of the vegetable.
  • Crustaceans : Crustaceans help the clean aquatic environment by getting rid of unhealthy remains and mass. They also decompose the remains of duckweed.
  • Mammals : Some mammals do not feed on other foods but duckweeds and other plants. Some can eat normal foods but had the privilege only to eat duckweeds.

Koi fish will eat duckweed anywhere it comes across it. They can make duckweed their main and only meal if they have no other food options.


Hello, I'm Jason. I'm the guy behind I volunteer at my local fish shop and I created this site to offer tips and advice on the fish I care for.

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