Species profile
Western Mosquitofish
Gambusia affinis
At a glance
Western Mosquitofish (Gambusia affinis) is an IUCN Least Concern bony-fish species regulated in 3 of 66 jurisdictions tracked by CatchRules across the U.S. and Canada.
Confirmed by 14,850 research-grade iNaturalist observations, with Texas, California, and Ohio the top jurisdictions by observation count.
Notable details
- Females grow up to 7 cm; males are much smaller, rarely exceeding 3.5 cm.
- Gives birth to live young rather than laying eggs, producing several broods per year.
- A single fish can consume up to 100 mosquito larvae per day.
- Tolerates water temperatures from near freezing to 42°C and survives in low-oxygen conditions.
- Introduced to over 40 countries for mosquito control, it is now considered invasive in many regions.
Where Western Mosquitofish are seen
Jurisdictions with rules for Western Mosquitofish
Background
The western mosquitofish (Gambusia affinis) is a species of freshwater fish, also known commonly, if ambiguously, as simply mosquitofish or by its generic name, Gambusia, or by the common name gambezi. There is also an eastern mosquitofish (G. holbrooki).
Background excerpt adapted from Wikipedia's Western Mosquitofish article (CC BY-SA). Visit Wikipedia for the full entry.
Other bony fish on CatchRules
Photo credit: iNaturalist / Wikipedia. Identification reference only — verify regulations with the issuing wildlife agency before retaining a catch.