Do Koi Eat Mosquito Larvae? {Are They Good For Koi?}

Have you noticed mosquito larvae in your pond and are you wondering do koi eat mosquito larvae?

Do you think they can be harmful to your koi fish, or will they serve as food?

This article will talk about mosquito larvae and their activities with koi fish.

Do Koi Eat Mosquito Larvae?

Koi fish will eat mosquito
larvae when they cross paths. Mosquito larvae are rich in protein and are also small enough to fit into the mouth of several koi fish.

Do Koi Eat Mosquito Larvae

Koi fish are not picky eaters as they will take delight in whatever fits into their mouths.

Will Koi Fish Eat Mosquito Larvae?

Koi fish are one of the few fish that will eat mosquito larvae when they come across them. Goldfish, mosquito fish, minnows, guppies, etc., comprise the mosquito-eating fish list. But, what do you know about mosquito larvae?

Mosquito larvae are a by-product of the complete metamorphosis mosquitoes undergo. Mosquitoes are insects that breed and grow in water till they become adult enough to fly.

Mosquito larvae are just a stage out of the four stages of a mosquito’s life.

The first stage of the mosquito life is the egg stage. Mosquitoes will lay eggs in water, especially stagnant ones. The eggs, also known as a raft, form a cluster and float in the water.

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Koi fish might not eat the mosquito eggs, but they will patiently wait for them to hatch into larvae.

The egg is the beginning stage of the mosquito’s life cycle. Some aquarists even cultivate and farm mosquito eggs to serve as a good source of food for your koi fish.

The second stage of the mosquito’s life is the mosquito larvae. Most fish, including koi fish, find mosquito larvae irresistibly tasty. The eggs hatch into the mosquito larvae, also known as wiggler, a food for koi fish.

You can identify these larvae by their wiggling movement in the water. The larvae feed on algae in the water, while koi fish see them as a food source. The mosquito larvae wiggle their stage into the next one.

The stage that emerges is the mosquito pupa. This stage is not difficult to identify as the pupa has a comma shape, a “roll and tumble” motion through the water. Fish will still eat mosquito pupa when they come across them.

After the pupa stage, the adult stage comes next. The pupa hatches into the adult mosquito, and the cycle begins all over when the mosquito lays eggs. Unlike the other stages, the adult mosquito does not stay in the water.

The mosquito lives all three-quarters of its life in water and a quarter in air. The underwater stages of the mosquito last for 5 to 15 days. It means your fish can have free food for 5 to 15 days before they emerge as adult mosquitoes.

Are Mosquito Larvae Bad for Koi?

Mosquito larvae are not bad for koi fish. In fact, they offer fish nutritional benefits, making aquarists farm them for their fish. Below are some of the benefits of mosquito larvae to fish.

  • Fish Color : One of the nutritional benefits of mosquito larvae is the improvement of fish skin. This benefit is mostly beneficial to colorful fish like koi fish, goldfish, guppy, etc. Aquarists rear mosquito larvae to ensure their fish maintain colorful skin.
  • Breeding : Another benefit of fish-eating mosquito larvae is to improve their breeding activities. Although aquarists do not really farm mosquito larvae because of this benefit, it is one of the benefits of feeding mosquito larvae to your fish.
  • Health : Mosquito larvae are good at maintaining good health for your fish. They provide nutrients that help keep your fish up for every one of its daily activities. Aquarists will farm and feed mosquito larvae to their fish to ensure their good health.

Do Koi Ponds attract Mosquitoes?

Mosquitoes like to start their generation in stagnant waters due to several reasons. They won’t lay their eggs in moving water as the water can transport their eggs away, which is not secure. Koi ponds do not feature stagnant but running water, so they are not a realistic breeding position for mosquitoes.

Mosquitoes can get attracted to your koi fish pond, but this will happen on rare occasions. If your pond water is stagnant, then you should expect mosquitoes to visit. If you do not want mosquitoes in your pond, you have to make sure the water keeps running every time.

How to Mosquito Proof Your Koi Pond

If you do not want mosquitoes in your pond, you have to get rid of them. You have to make sure they do not get close to your pond. How do you do this? Below are a few ways you can prove your pond of mosquitoes.

  • Keep Water Running : Mosquitoes will not associate themselves with moving waters. Their eggs will not survive in moving waters, and breeding is the main reason mosquitoes come to water. If your pond water is not stagnant, mosquitoes will not come near it.
  • Get Rid of Algae : Mosquito larvae feed on algae. Without food, these lots will not survive, so one of the effective ways to get rid of them is to remove every alga in it. Mosquitoes will also not lay their eggs in it when they see there is no promising food for their upcoming young.
  • Add Mosquito Eating Fish : Another effective way to get rid of mosquitoes and their larvae is to add fish that eat them. The fish will feed on every larva they can find, reducing the population of mosquitoes produced from your pond.
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Other Fish That Eat Mosquito Larvae in Ponds

Aside from koi fish, there are several other fish that feed on mosquito larvae. You can introduce these fish to your pond to help you control mosquito larvae. Below is the list of fish that feed on mosquito larvae in the pond;

  • Goldfish
  • Guppies
  • Golden orfe
  • Mosquito fish
  • Common pleco
  • Minnows

Koi fish will eat mosquito larvae whenever they come across them. If you have many larvae in your fish, the koi fish will eat them as a meal. You can also add other fish that eat mosquito larvae in the pond if you want to get rid of the larvae.


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.