Actinopterygii (ray-finned fishes) > Cyprinodontiformes
(Rivulines, killifishes and live bearers) > Poeciliidae
(Poeciliids) > Poeciliinae
Etymology: Xiphophorus: Greek, xiphos = sword + Greek, pherein = to carry (Ref. 45335). More on author: Heckel.
Environment / Climate / Range
Freshwater; brackish; benthopelagic; pH range: 7.0 - 8.0; dH range: 9 - 19; non-migratory. Tropical; 22°C - 28°C (Ref. 52054); 26°N - 12°N
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 14.0 cm TL male/unsexed; (Ref. 26130); 16.0 cm TL (female); common length : 2.8 cm TL male/unsexed; (Ref. 12193)
soft rays: 8 - 10. This species is distinguished by having a medium to large swordtail with a long straight caudal appendage; midlateral stripe may be dusky or brownish (northern populations) or red; 2 additional reddish stripes may be present above midlateral line and one beneath; terminal segment of gonopodial ray 3 produced into a crescent-shaped hook and blade pointed distally; ray 4a curves strongly backward over the blade at an angle greater than 90°; distal serrae of ray 4p reduced in size and number and proximal serrae rather slender; terminal segment of ray 5a produced into a claw, several times larger than the distal serrae of ray 4p (Ref. 52914).
North and Central America: Rio Nantla, Veracruz in Mexico to northwestern Honduras. Africa: Feral populations reported from Natal and eastern Transvaal as well as in Lake Otjikoto, Namibia (Ref. 7248). Several countries report adverse ecological impact after introduction.
Found mainly in rapidly flowing streams and rivers, preferring heavily vegetated habitats (Ref. 26130). Occurs in warm springs and their effluents, weedy canals and ponds (Ref. 5723). Feeds on worms, crustaceans, insects and plant matter (Ref. 7020). Used for genetics research (Ref. 4537). Especially the red varieties are very popular aquarium fishes (Ref. 1672). Aquarium keeping: the males aggressive towards each other; minimum aquarium size 80 cm (Ref. 51539).
Wischnath, L., 1993. Atlas of livebearers of the world. T.F.H. Publications, Inc., United States of America. 336 p.
IUCN Red List Status (Ref. 90363)
Threat to humans
Fisheries: of no interest; aquarium: highly commercial
Estimates of some properties based on empirical models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00815 (-0.18821 - 0.20451), b=3.18 (3.08 - 3.29), based on LWR estimates for this family-BS (Ref. 93245
Trophic Level (Ref. 69278
): 3.2 ±0.43 se; Based on food items.
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months (tm<1;Fec=20-200 * 12).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (33 of 100) .