Eastern Mosquitofish
ExploreFish
Eastern Mosquitofish
gambusia holbrooki
The Eastern Mosquitofish is a small, lively fish that's great for controlling mosquito populations! They zip around in the water, making them fun to watch as they play and explore their home.
Habitat: Ponds, streams, and marshes across the eastern United States.
Appearance
The Eastern Mosquitofish is a small, slender fish with a flattened head and an upward-pointing mouth. It has a dull greyish-olive back fading to a silvery-white belly, often with a dark 'gravid spot' visible on females. Its small size and distinct male anal fin (gonopodium) differentiate it.
KingdomAnimaliaPhylumChordataClassActinopterygiiOrderCyprinodontiformesFamilyPoeciliidaeGenusGambusia
Category
FishRarity
Common
Danger
0/5 · No known danger
Snaps
9
Interesting facts
Female mosquitofish can store sperm for months, making many batches of babies!
Introduced worldwide to fight mosquitoes, they are now one of the most widespread fish!
These tiny fish can gulp air from the surface when water oxygen is low!
They are super tiny but can be aggressive, nipping the fins of larger fish!
Special abilities
Ability
Mosquito Muncher
Eastern Mosquitofish can devour large numbers of mosquito larvae, which helps them control insect populations in their watery homes.
Ability
Live Birth Giver
Eastern Mosquitofish has the amazing ability to give birth to live, fully formed young, skipping the egg stage for survival.
Ability
Tough Survivor
Eastern Mosquitofish can endure harsh conditions like low oxygen because of its adaptable gill and kidney systems.
Measurements & details
- Length
- 2-6 cm
- Weight
- 0.001-0.005 kg
- Lifespan
- 1-2 years
- Swim Speed
- 8 km/h
- Maximum Depth
- 2 m
- Water Type
- Freshwater
Diet & Feeding
These tiny fish are expert insect hunters, gobbling up mosquito larvae and other small critters.
Primary Foods
- mosquito larvae
- aquatic insect larvae
- zooplankton
- small terrestrial insects
Foraging Method
- Foraging
Ecological connections
eats
Yellow Fever Mosquito
Aedes aegypti
eats their larvae, helping control mosquito populations
eaten by
Largemouth Bass
Micropterus salmoides
a common food source for this larger predatory fish
eaten by
Mallard Duck
Anas platyrhynchos
small size makes them prey for waterfowl
Traits
Social
Social animals live in organized groups, cooperating for survival benefits such as foraging, defense, and raising offspring.
Colorful
Colorful describes organisms or objects displaying a wide range of bright and distinct colors.
Carnivorous
This trait identifies organisms whose diet consists entirely or primarily of animal tissue.
Diurnal
Diurnal animals are primarily active during daylight hours, typically resting or sleeping at night.
Aquatic
Aquatic habitats encompass environments where organisms live predominantly in water, including oceans, rivers, lakes, and wetlands.
Also known as
GambusiaMosquito FishTopminnow
Collections
Safety
Danger
0/5 · No known danger
No special safety notes yet.
Frequently Asked Questions
How to identify Eastern Mosquitofish?
The easiest way to identify Eastern Mosquitofish is to use the Snappit nature identifier app.
How long is Eastern Mosquitofish?
2-6 cm
How much does Eastern Mosquitofish weigh?
0.001-0.005 kg
How long does Eastern Mosquitofish live?
1-2 years
What does Eastern Mosquitofish eat?
These tiny fish are expert insect hunters, gobbling up mosquito larvae and other small critters.
How fast can Eastern Mosquitofish swim?
8 km/h
Where is Eastern Mosquitofish usually found?
Ponds, streams, and marshes across the eastern United States.
How does Eastern Mosquitofish hunt?
Foraging
Snap Map
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Recent Snaps
Apr 26, 2026
Buckingham Female Collegiate Institute Historic Districti
Photo attribution
(c) James Weaver, some rights reserved (CC BY)
License: CC BY 4.0 ↗
Image may be shown cropped inside the card frame.
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