Fin's Fish Guide
The Panuco swordtail (Xiphophorus nigrensis) is a freshwater fish of the family Poeciliidae that grows up to 6 cm.
Description
The Panuco swordtail is a small livebearing toothcarp from the Río Pánuco basin in Mexico. The species reaches only about 6 cm and inhabits fast-flowing river segments with steep, vegetated banks. Males bear the elongated lower caudal-fin rays ('sword') characteristic of swordtails. The species is known for heritable size differences among males: large males court, while small males use a sneaking mating strategy. As an omnivore it eats algae, detritus and small invertebrates. The species is kept in the aquarium hobby and is harmless to humans.
Frequently asked questions
How do you recognise the Panuco swordtail?
The Panuco swordtail has a torpedo-shaped body, is mainly yellow-gold and shows a plain pattern. Males with a tail sword and hereditary size differences with alternative mating strategies.
Where does the Panuco swordtail live?
The Panuco swordtail lives in fresh water and is mostly found around mixed bottom. Freshwater of the Río Pánuco basin in Mexico.
How big does the Panuco swordtail get?
The Panuco swordtail grows to a maximum of about 6 cm.
Is the Panuco swordtail dangerous to humans?
No, the Panuco swordtail is harmless to humans. This species is harmless to humans. No specific first aid is needed. Still handle the fish with care: mind the fin rays and the sharp edges of the gill cover, and rinse any scratch with clean water and cover it. For a dirty or deep wound check tetanus status.
Is the Panuco swordtail edible?
Yes, the Panuco swordtail is commonly eaten.
More photos
Want the complete picture on the Panuco swordtail?
Point your camera at the fish and Fin names the species in seconds. Free, and the Panuco swordtail is one of 12,519 species in the app.
All data
Identification
Appearance
Habitat & distribution
Behaviour & biology
For anglers
Safety
Status & sources
Same genus Xiphophorus
More from the family Poeciliidae
Want the complete picture on the Panuco swordtail?
Point your camera at the fish and Fin names the species in seconds. Free, and the Panuco swordtail is one of 12,519 species in the app.