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Poecilia sphenops, called the Mexican molly or simply the molly, is a species of poeciliid fish from Central America. It was once understood as a widespread species with numerous local variants ranging from Mexico to Venezuela, but these variants are today considered distinct species belonging to the P. sphenops complex and P. sphenops itself as being native to Mexico, Guatemala, and Honduras.
Amazon mollies have a small dorsal fin consisting of 10-12 soft rays. [9] The position of the dorsal fin on the back of the fish is anterior, closer towards the head, than the position of the anal fin on the underside of the fish. They do not have any spiny rays on their fins. [10]
A pregnant Southern platyfish. Pregnancy has been traditionally defined as the period of time eggs are incubated in the body after the egg-sperm union. [1] Although the term often refers to placental mammals, it has also been used in the titles of many international, peer-reviewed, scientific articles on fish.
Histotrophic (tissue eating) viviparity means embryos develop in the female's oviducts but obtain nutrients by consuming other tissues, such as ova or zygotes. [10] This has been observed primarily among sharks such as the shortfin mako and porbeagle , but is known for a few bony fish as well such as the halfbeak Nomorhamphus ebrardtii . [ 12 ]
Sailfin mollies produce broods of 10–140 live young, depending on maturity and size, and females may store sperm long after the demise of their relatively short-lived mates. The gestation period for this species is about three to four weeks, depending upon temperature, and a single female may give birth on multiple occasions throughout the year.
Experts used 4D ultrasounds of foetuses to check their reaction to what mothers have just eaten.
The most commonly kept species are guppies (P. reticulata), mollies (P. sphenops or P. latipinna), and Endler's livebearers . Members of the genus readily hybridize with each other and so most commercially offered fish are hybrids (with guppies having some Endler, and mollies being a mix of common and sailfin mollies).
Fetuses in the womb scowled after their mothers ate kale but smiled after they ate carrots, according to a new study of around 100 pregnant women and their fetuses in England.. The study offers a ...