Can Goldfish Eat Mosquito Larvae?

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Goldfish are known to be easy to care for, especially from a dietary standpoint. They are omnivorous and will typically eat a variety of foods, with a few exceptions. These fish are easy to grow in captivity because they have adapted to consuming commercial food quite easily.

That being said, they prefer live food, which is typical for most fish. Mosquito larvae are especially attractive thanks to their palatability and highly nutritious content. Goldfish consume them naturally in the wild, contributing to reducing the number of mosquitos in the region.

But are these insects safe for your fish? Let’s find out!

Are Mosquito Larvae Safe for Goldfish?

Mosquito larvae are generally safe for goldfish, but it all comes down to where you’re sourcing them. Wild-caught mosquito larvae can carry environmental pollutants due to the insect’s life cycle. Mosquitos undergo 4 developmental phases, from egg to larva, pupa, and adult. The first 3 phases, however, take place in an aquatic environment, preferably in stale waters.

If chemical contaminants leak into the water, the larvae will become contaminated and risk infecting the fish. This is why I generally advise against feeding goldfish wild-caught live food. The risk of contamination can be high, causing the fish’s death in many cases.

Wild insects also carry various pathogens that can infect your goldfish.

Benefits of Mosquito Larvae for Goldfish

I would say that mosquito larvae carry 3 nutritional benefits for your goldfish:

  1. High nutrient count – Mosquito larvae are packed with protein, fiber, and some crude fats that will boost your goldfish’s coloring, size, and growth rate. These nutrients are essential to a well-balanced and diverse diet, although in moderation.
  2. Easy to eat – Goldfish find mosquito larvae tasty, as eating them is written in the fish’s genetic code. So, your fish is unlikely ever to refuse them, no matter the food alternatives available.
  3. A safety net – Not all goldfish enjoy flakes and pellets. Some are more difficult to please, which is where live food like mosquito larvae comes in. These make for a good food option when most other options fail, providing your goldfish with nutrients until the fish learns to eat something else.

Mosquito larvae are a natural food for goldfish, but you should abuse them. They also come with some health hazards that you should be wary of.

Risks of Mosquito Larvae for Goldfish

I would say that there are 2 primary risks associated with feeding mosquito larvae to your goldfish.

  • Contamination risks – We’ve already discussed this one. Depending on where you’re getting the larvae, they can be contaminated with various chemicals that will put your goldfish’s life at risk. You can prevent this by getting your larvae from trustworthy sources or cultivating them at home.
  • Digestive risks – It’s easy for goldfish to overeat mosquito larvae, especially since they like them so much. They might face digestive problems if they do, which happens often when overeating. Too much protein isn’t good for goldfish either, which is why I recommend feeding them mosquito larvae occasionally, not every day.

But where should you get your mosquito larvae from to make sure that they’re safe for your goldfish?

Sourcing Mosquito Larvae for Goldfish

If you intend on introducing mosquito larvae to your goldfish, there are 2 primary sources to consider:

– Frozen Mosquito Larvae

You can purchase these from fish food stores. They usually come in the form of frozen cubes which you can use at your own discretion to enrich your goldfish’s diet. The main advantage is that frozen mosquito larvae will last for months or even years when kept in a frozen state.

The main disadvantage is that you can never measure their nutritional quality. Some companies will freeze the larvae after death and keep them in unfit conditions, reducing their nutritional content drastically. Get your frozen mosquito larvae from trustworthy producers with a clean reputation in the field to prevent that.

– Live Mosquito Larvae

When it comes to live larvae, you have 3 options: buy them, catch them in the wild yourself, or breed them at home. Each of these options comes with its own pluses and minuses to consider. If you’re buying them, you need to make sure they’re safe. Check the conditions they’ve been kept in or, if that’s not possible, go for high-profile, trustworthy sellers over the shadier ones.

Catching them yourself will take a lot of time and will come with plenty of health risks which we have already discussed. That being said, if you have a pond or a lake nearby that’s rich in mosquito larvae and doesn’t show signs of pollution, go for it. Wild-caught larvae are the best thing for your goldfish since they are fresh and contain the most nutrients.

When it comes to growing the larvae yourself, that’s also possible, provided you’re ready to put in the work necessary to get the best out of it.

I would say that the benefit of live food is the surplus of protein and nutrients. These larvae are not processed and come with their nutrients intact. The problem is that they won’t last for very long. You will need to have a steady flow of larvae and collect them regularly to make sure your goldfish have them available.

How to Feed Mosquito Larvae to Goldfish?

When it comes to feeding mosquito larvae to your goldfish, consider the following 2 points:

  1. Frozen larvae – Provide your fish enough larvae for them to consume within several minutes. Then remove the leftovers. These will sink at the bottom, decay, and increase water ammonia and nitrites over time. Your goldfish may attempt to eat them later on, but maybe not, and it’s not worth the risk.
  2. Live larvae – The feeding process is similar, except, this time, you don’t necessarily need to remove the uneaten larvae. These are alive, so they will remain alive in the water until the fish is ready to eat again.

Make sure your goldfish doesn’t overeat since these larvae carry a lot of protein and fats. They can hurt your fish’s digestive system, especially since goldfish don’t understand the idea of moderation. Goldfish are like children in a candy bar; they don’t intend to get fat and develop digestive problems, but they will.

Can You Make a Mosquito Larvae Culture?

Yes, you can have a mosquito larvae culture at home with the right setup and knowledge set. The steps involved in growing mosquito larvae right in your back garden include:

  • Choosing the right container – You will need a container with water since mosquitos only lay their eggs in water. Get a bucket, an old aquarium, or any other larger recipient, preferably with a large water surface. The mosquitos need to find it with ease and have a lot of water surface available to lay their eggs.
  • Prepare the water – Remember, mosquitos only reproduce in stale and dirty waters. They don’t like clean waters that much. So, allow your water to sit for a couple of weeks. This will promote algae growth, creating the perfect environment for mosquitos.
  • Choosing the location – Find a shady area, protected from direct sunlight. You will place your container there and wait. If the water is too warm, the eggs won’t survive. You should also protect the container from rainfall to avoid spillage and keep the eggs and the coming larvae safe.
  • Begin the waiting game – Mosquitos will begin to reproduce during the warm season. If the weather is nice and hot, your water container will get its mosquito visitors soon, especially in the afternoon.
  • Time to collect – The larvae will soon appear as the eggs begin to hatch. You should check the container regularly to observe the progress and realize when it’s time to collect. The larvae are small, like tiny, wriggly yellow worms with blackish heads. I recommend collecting them with a brine shrimp net; otherwise, the larvae will slip through the net’s openings.

Once collected, the larvae are good to feed to your goldfish. You can either feed them while still alive, mix them in a homemade nutritious paste, or freeze them for later use.

More importantly, keep the container ready since mosquitoes will produce eggs throughout the warm season.


Goldfish love their mosquito larvae occasionally. Just make sure they come from trustworthy sources, and you don’t overfeed the fish.

Author Image Fabian
I’m Fabian, aquarium fish breeder and founder of this website. I’ve been keeping fish, since I was a kid. On this blog, I share a lot of information about the aquarium hobby and various fish species that I like. Please leave a comment if you have any question.
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