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Use an eye dropper or small net to catch your larvae. Place unhatched egg boats in your fish tank. Capture larvae "wrigglers" and place them in your fish tank. Harvest your larvae weekly. Dispose of dead larvae.

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Mosquito larvae are very small, so make sure you purchase a small aquarium net designed to capture tiny aquatic life. Nets designed for brine shrimp will work perfectly. You can also use an eye dropper to capture individual or small groups of eggs or larvae. Make sure to transfer the larvae or eggs into your aquarium quickly so they don't die before your fish can eat them. Pouring your water container into your aquarium is not advised, as you may not want to introduce the algae and debris in the mosquito's water to your tank. Most fish probably will not immediately eat the small egg "boats" but they will attack the "wrigglers" or larvae as they emerge from the eggs. This is the best way to ensure your mosquito larvae don't grow into full grown pests in your backyard. It's okay if your fish eat the egg boats before they hatch. These eggs will usually hatch within 48 hours of being laid, so you may not find them very often. You are much more likely to encounter larvae than unhatched eggs because of how quickly eggs hatch. Mosquito larvae will come to the surface regularly to breath. Larvae will shed their skin as they grow, so you may find empty bits of larvae skin. Fish are unlikely to eat shed skin. Larvae appear to have antennae which are actually siphon tubes used for breathing. Larvae that enters the pupa stage will look as though they have developed a head and will no longer feed on algae. These can be fed to fish, but should otherwise be washed down the drain as it is the last stage before flying. Even if you have more larvae than you can feed your fish, it's important that you purge your developing larvae on a weekly basis. Depending on the environment, mosquito eggs can develop into full grown, flying pests in as little as four days or as long as two weeks. To avoid cultivating a swarm of mosquitoes in your yard, purge any larvae your fish don't eat by pouring the water down the drain. Pouring your water out in your yard may not prevent the larvae from becoming full grown mosquitoes. Your fish likely will not eat dead larvae, so if some do not survive you can simply discard them with the water as you change it each week. If all of the larvae is dying, there is an issue with the temperature or quality of the water. If you used tap water, there may have still been some chlorine present. Chlorine will kill mosquito larvae. If your bucket received direct sunlight at some point of the day, it may be becoming too hot for larvae to survive in the water.