Gambusia affinis

Gambusia affinis
Western Mosquitofish – Gambusia affinis
FamilyScientific NameAuthorYearCommon Name
PoeciliidaeGambusia affinis(Baird and Girard)1853Western Mosquitofish

Gambusia affinis

Unique Characters: Large dusky, black teardrop (often reduced) below eye. One to three rows of spots on dorsal and caudal fins. Dorsal rays usually 6; anal rays 9. Third ray of the anal fin in the male without teeth, smooth.

Gambusia gonopodium
Gambusia gonopodium

Gonopodiums: Gambusia affinis on the left; G. holbrooki on the right. From Rohde et al. (2009), modified from Etnier and Starnes (1993).

Similar Species:

Eastern Mosquitofish Gambusia holbrooki. Dorsal rays usually 7; anal rays usually 10. Third ray of the anal fin of the male with series of prominent teeth.

Gambusia holbrooki
Eastern Mosquitofish – Gambusia holbrooki

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