
Source: Wikimedia Commons
Poecilia velifera
A large livebearer whose males raise a huge sail-like dorsal fin. Endemic to the Yucatan peninsula of Mexico, it needs hard alkaline water and weakens in soft water.
Poecilia velifera is a livebearer endemic to the Yucatan peninsula of southeastern Mexico that also enters brackish water. FishBase gives a total length of 15.0cm and Seriously Fish a standard length of 150mm. Males carry a tall, sail-like dorsal fin that they spread in display. That fin fails to develop fully in small or overcrowded tanks, so Seriously Fish advises as large an aquarium as possible and suggests 91 x 38cm, about 104 litres. Its water requirements are specific: moderately hard or harder water with a basic pH is essential. In soft or acidic water it weakens quickly, showing shimmying, fungus or clamped fins. Salt is not required; what matters are hardness minerals such as calcium and magnesium. It is a livebearer with a gestation of four to eight weeks, producing 20 to 60 young typically and up to 200. Because its range is confined to the peninsula, the IUCN assessed it as Vulnerable in 2018.
Source: Wikipedia (CC BY-SA 4.0)
The Sailfin Molly lives 4-6 years.
The Sailfin Molly grows to About 15cm.
The ideal temperature for the Sailfin Molly is 22〜28℃.
Origin
Central America (southeastern Mexico, Yucatan peninsula)
Lifespan
4-6 years
Sources: FishBase / Seriously Fish
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Poecilia velifera (Regan, 1914)
Synonyms: Mollienisia velifera
Authority databases: FishBase
Nomenclature follows global taxonomic authority databases.
Sources: CITES Appendices (species not listed) / IUCN Red List
Regulations may change. Always verify the latest information with the relevant authorities.
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Size
About 15cm
Temperature
22〜28℃
Prepared foods, frozen foods, vegetable matter such as blanched spinach or cucumber
Seriously Fish suggests 91 x 38cm, about 104 litres, and advises as large a tank as possible. In cramped or overcrowded tanks the male's dorsal fin does not develop fully.
Seriously Fish gives 22-28C, pH 7.0-8.5 and 15-35dGH. It deteriorates quickly in soft or acidic water. Salt is unnecessary; hardness minerals are what matter.
It is peaceful in a community but only with species that tolerate hard water, such as swordtails, platies, hardy corydoras and some barbs and tetras. Avoid other mollies, which will hybridise with it.
It is omnivorous and takes dried, frozen and live foods. Always include vegetable matter such as blanched spinach, cucumber or vegetable flake.
It is a livebearer. Seriously Fish rates breeding as relatively difficult for a livebearer and recommends trios of one male to two females. Gestation runs four to eight weeks, producing 20 to 60 young and up to 200.
Seriously Fish regards it as the more demanding member of its genus. Shimmying and clamped fins signal water that is too soft. IUCN status is Vulnerable. The name sailfin molly is also used for the closely related Poecilia latipinna, and farmed stock includes hybrids of the two. Juveniles can only be separated by dorsal fin ray count, given as 18 to 19 in this species against 14 in P. latipinna.
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The ideal temperature for Sailfin Molly is 22〜28℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Sailfin Molly is 4-6 years. With proper care and nutrition, they can live a long and healthy life.
Sailfin Molly typically reaches About 15cm as an adult. Size may vary depending on care conditions and individual genetics.
Sailfin Molly feeds on: Prepared foods, frozen foods, vegetable matter such as blanched spinach or cucumber. Aim for a balanced diet with appropriate feeding frequency.
The price of Sailfin Molly varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 17, 2026