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see killifishkillifish,
any of more than a thousand species of small fish of the several families of the order Cyprinodontiformes (toothed minnows or toothed carps), a group that includes also the topminnows and many popular aquarium fishes (e.g.
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; mollymolly
or mollie,
New World fish of the genus Poecilia, which includes the guppy or rainbow fish, Poecilia reticulata. Mollies, which are related to the killifishes, are found from the E and central United States to Argentina.
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(Lebistes reticulatus), a fish of the family Poeciliidae of the order Cyprinoidae. The males measure up to 4 cm long and the females, up to 6 cm. The coloration of the males is a combination of black, red, light blue, silver, and gold tones. The females are gray, sometimes gold. The guppy is found in the freshwaters of Venezuela, northern Brazil, Guiana, and the islands of Barbados and Trinidad. It is one of the most popular aquarium fish. A number of varieties have been bred which are larger and more brightly colored than the original form, with elongated caudal (trailing) or dorsal fins (scarf).


Il’in, M . N. Akvariumnoe rybovodstvo, 2nd ed. Moscow, 1968.


a small brightly coloured freshwater viviparous cyprinodont fish, Lebistes reticulatus, of N South America and the Caribbean: a popular aquarium fish
References in periodicals archive ?
Biologists have long known that female Poecilia reticulata guppies store sperm.
Bubble Guppies is created and executive-produced by Jonny Belt and Robert Scull and co-executive produced by Janice Burgess, the Emmy Award-winning team behind the hit Nickelodeon series' The Backyardigans and Little Bill.
UCLA's Kerry Deere, the lead author of the study, conducted experiments in which she presented female guppies (Poecilia reticulata) with a choice of males with low, medium and high levels of drosopterin to see which males they preferred.
The data collected show clear differences between the response of a single guppy and the responses of guppies in a group of four to the presence of a real predator, the pike cichlid (Figure 1).
In a study on wild populations of guppies in the rainforest of Trinidad, Dr Croft and his colleagues found that female guppies swim in habitats that contain predators but few males.
The fish used in this study were healthy, wild-type guppies (Poecilia reticulata) imported from Colombia and bred through several generations in 500-L stainless-steel tanks at 25 [+ or -] 2 [degrees] C and a daily 12-hr simulated daylight illumination.
Both the guppies and the black mollies are closely related to the swordtails, platys and mosquito fish.
But it's a survival mechanism which serves guppies well in their native South America.
Reznick explained that male guppies are brightly colored and very variable in coloration.
However, when he and his colleagues compared guppies from streams with many predators with streams posing few threats, the prediction failed.
Though the differences are tiny - imperceptible to a layperson - the researchers found that the lizards were changing physically at a pace rivaled only by the Trinidad guppies.
Washington, Nov 24 (ANI): Though guppies, also known as the millionfish, have evolved over at least half-a-million years, yet a characteristic orange patch on the male fish has remained remarkably stable, though it could have become redder or more yellow.