Swordtail


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Swordtail

 

(Xiphophorus helleri), a fish of the family Poeciliidae of the order Cyprinodontidae. It is found in the fresh waters of Mexico and Guatemala. Males are up to 8 cm long, and females 12 cm. The lower part of the male’s caudal fin has the distinctive form of a sword. Swordtails are grayish olive, with a longitudinal red stripe and several shorter reddish bands parallel to it. The females, which are not as brightly colored as the males, are live-bearers. The swordtail is a popular aquarium fish. It hybridizes with the closely related platy (X. maculatus) to form black, red, lemon, mottled red, and other varieties.

REFERENCE

Il’in, M. N. Akvariumnoe rybovodstvo, 2nd ed. Moscow, 1968.
References in periodicals archive ?
In clove-oil applications, induction times of swordtail fish were shown in Figure 3A and total recovery times were shown in Figure 3B.
Female preference variation has implications for the maintenance of an alternative mating strategy in a swordtail fish.
Lower protein levels (20%) produce lower protein content in muscle and ovary tissue in swordtail (7,8), which could be explained by the utilization of the body protein reserves and hence deficiency in protein for corporal growth and oocyte development.
Swordtail males have the lower caudal fin rays elongated to various lengths, and the platies have none.
Crapon de Caprona and Ryan found that female swordtails spent more time on the side of the test tank filled with water that had been inhabited by a male swordtail than on the side filled with uncontaminated water, indicating that the female recognized and preferred olfactory cues given off by the male.
Prior to 1988, all known populations of the pygmy swordtail fish, X.
Male swordtail, Xiphophorus nigrensis, carry one of three alleles at the Y-linked P (pituitary) locus from the father (Kallman 1984, 1989).
1993), and since has been identified in several fish species, including flounder, mud loach, sea bass, sea bream, plunderfish, swordtail fish, channel catfish, black progy, medaka and pufferfish (Cho et al.
In the case of teleosts, it was reported in the 1960s that the erytnro-phores of Xiphophorine fish, such as the swordtail (Xiphopho-rus helleri) and platyfish (X.
Washington, July 13 ( ANI ): Male representatives of the tropical fish known as swordtail characins have flag-like sex ornaments that catch mates just like the bait on a fishing rod would, according to a new study.
Effect of osmotic inmobilization on refrigerated storage and cryopreservation of sperm from a viviparous fish, the green swordtail Xiphosphorus helleri.
Chemical Traits Female preferences for the scent of well-fed males in the swordtail fish, Xiphophorus birchmanni.