Porthole Livebearer and Similar Species
Poeciliopsis gracilis
Got a photo? Identify fish instantly with the Fishby app.
Open the appSeveral fish can be confused with Porthole Livebearer. Here are the key differences.
Species often confused with {name}
Mosquitofish
Gambusia affinis
Key differences: Gambusia affinis typically has a more robust body, a less distinct pattern of spots (often a single dark spot on the caudal peduncle), and a more aggressive temperament. Poeciliopsis gracilis is generally more slender and has the distinct 'porthole' markings.
Other Poeciliopsis species
Various Poeciliopsis spp.
Key differences: Different Poeciliopsis species can be very similar. P. gracilis is distinguished by its specific pattern of lateral spots. Detailed examination of fin ray counts, body proportions, and gonopodial structure may be necessary for definitive identification among closely related species, especially in areas of sympatry.
Explore Porthole Livebearer
Identify fish anywhere
Free on iOS, Android, and Web. Photo identification, full species details, and more.