Biology:Poecilia sphenops

Short description: Species of fish

Molly
Male molly
Conservation status
Least Concern (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Cyprinodontiformes
Family:	Poeciliidae
Genus:	Poecilia
Species:	P. sphenops
Binomial name
Poecilia sphenops (Valenciennes, 1846)
Synonyms
Mollienisia sphenops (Valenciennes, 1846) Poecilia thermalis Steindachner, 1863 Gambusia modesta Troschel, 1865 Gambusia plumbea Troschel, 1865 Poecilia chisoyensis Günther, 1866 Poecilia dovii Günther, 1866 Poecilia spilurus Günther, 1866 Platypoecilus mentalis Gill, 1877 Poecilia boucardii Steindachner, 1878 Platypoecilus nelsoni Meek, 1904 Platypoecilus tropicus Meek, 1907 Poecilia tenuis Meek, 1907 Poecilia spilonota Regan, 1908 Poecilia caudata Meek, 1909 Mollienesia macrura Hubbs, 1935 Mollienesia vantynei Hubbs, 1935 Mollienesia altissima Hubbs, 1936 Mollienesia pallida de Buen, 1943 Lembesseia parvianalis Fowler, 1949 Poecilia vetiprovidentiae Fowler, 1950

Poecilia sphenops is a species of fish, of the genus Poecilia, known under the common name molly; to distinguish it from its congeners, it is sometimes called short-finned molly or common molly. They inhabit fresh water streams, coastal brackish, and marine waters from Mexico to Colombia. The wild-type fishes are dull, silvery in color. The molly can produce fertile hybrids with many Poecilia species, most importantly the sailfin molly. The male mollies generally tend to be mildly aggressive.

Mollies rank as one of the most popular feeder fish due to high growth rate, birth size, reproduction, and brood number.

Biology

Mollies are similar in appearance to their livebearer cousins, the platy, swordtail and guppies; the molly tends to be slightly larger and more energetic. Many aquarists note the stronger individuality and aggression in keeping mollies versus platies, who appear much more docile.

Size

Standard size of male fish is 3.2″ (8 cm) and female fish is 4.8″ (12 cm).

Varieties

Selective breeding over centuries has produced several color variations and different body shapes.

• Short-finned molly or common molly: They inhabit fresh water streams and coastal brackish and marine waters of Mexico. The wild-type fishes are dull, silvery in color. The molly can produce fertile hybrids with many Poecilia species, most importantly the sailfin molly. The wild form is in fact quite rarely kept, as it has a rather plain silvery coloration suffused with brown and green hues.
• Black molly: It is a melanistic breed which are black all over. It is one of the most well-known aquarium fishes and nearly as easy to keep and prolific as guppies.
• White molly: A white colored molly.
• Golden molly: Nicknamed the "24 karat".
• Balloon molly: This fish has a deformed spine due to a genetic defect that gives it its appearance. Through selective breeding it is now widely available. Balloon mollies can still reproduce and live a normal life comparable to that of other mollies, but it has garnered controversy due to the belief that its defect gives it a shortened lifespan and a susceptibility to health problems.
• Lyretail: A breed with an altered caudal fin structure.
• Dalmatian molly: A silver colored breed with black speckles.

Gallery

• 

  A neon orange molly

• 

  A female black molly

• 

  A female spotted molly, 4 years old

References

• "Poecilia sphenops". Integrated Taxonomic Information System. https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=165904. Retrieved 30 January 2006. 
• Froese, Rainer and Pauly, Daniel, eds. (2005). "Poecilia sphenops" in FishBase. 10 2005 version.
• "Mollies Fish" Detailed information on raising the Molly fish. January 2022 version

Wikidata ☰ Q177832 entry