Poeciliidae

Marbled Swordtail

Xiphophorus meyeri

Fish Reaching Three Centimeters in North American Waters

• Tropical
• Northern Hemisphere
• Regional distribution
• Freshwater fish
• North America
• Small
• Tropical fish

The marbled swordtail (Xiphophorus meyeri) is a species of freshwater fish in the family Poeciliidae. It was endemic to the Rio Salado system (itself a part of the Rio Grande basin) in Coahuila, northeastern Mexico. It was restricted to springs, connected creeks and pools in waters with a pH slightly above neutral and temperatures of 16–26 °C (61–79 °F), with captive studies indicating that the optimum temperature is around 24 °C (75 °F).