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 ?
helleri, es el primer paso para la incorporacion de pre-adultos de mosquitos como alimento vivo, al menos en granjas piscicolas ornamentales.
Effect of varying dietary lipid and protein levels on growth and reproductive performance of female swordtails Xiphophorus helleri (Poeciliidae).
horizontale, 105 Panicum violascens, 114 Panicum zeyheri, 113 Paspalum bicorne, 99 Paspalum chinensis, 115 Paspalum fragile, 104 Paspalum fuscescens, 105 Paspalum fuscum, 115 Paspalum lanuginosum, 110 Paspalum longiflorum, 111 Paspalum minutiflorum, 115 Paspalum tridactylum, 96 Paspalum velutinum, 110 Red grass, 105 Syntherisma, 93 Syntherisma abyssinica, 96 Syntherisma aequatoriensis, 111 Syntherisma aequiglumis, 96 Syntherisma argillacea, 97 Syntherisma chinensis, 115 Syntherisma curvinervis, 103 Syntherisma fiebrigii, 104 Syntherisma fuscescens, 105 Syntherisma helleri, 115 Syntherisma insularis, 108 Syntherisma leucocoma, 114 Syntherisma velutina subsp.
An endemic Acjanaco species, Schizoeaca helleri, was recorded in this habitat.
Most of the morphs in aquaria have resulted from hybridization and the artificial selection of three species: Xiphophorus helleri Heckel, 1848, Xiphophorus maculatus (Gunther, 1866), and Xiphophorus variatus (Meek, 1904).
New shrubs, including Manhattan euonymus and helleri holly, and perennials, such as Solomon's seal, purple coneflower and King Alfred daffodil, have been planted to beautify this relaxing park.
A second-generation APC resistance test was performed on all included patients with a STACLOT[R] APC-R reagent set (Diagnostica Stago) with modifications; 100 [micro]L of prediluted test plasma (1:10 in factor V-deficient plasma) was incubated for exactly 3 min at 37[degrees]C with 100 [micro]L of Crotalus viridius helleri venom, after which 100 [micro]L of APC/calcium chloride was added, and the clotting time was recorded.
LANDSCAPE NOTES: Helleri Holly is a proven selection for the recommended zones.
PARASITE-MEDIATED SEXUAL SELECTION OF GREEN SWORDTAILS, XIPHOPHORUS HELLERI
This study will focus on what effect temperature may have on the number and gender of fish born in Xiphophorus helleri, Poecilia sphenops, Brachydanio rerios, and Oryzias latipes.
geniculatum; the Asteraceae Liatris helleri, Solidago spithamanea, and Arnoglossum [=Cacalia] rugelia, also endemic; the Crassulaceae Sedum rosea; the Scrofulariaceae Aureolaria patula; the Ranunculaceae Cimifuga ribifolia; the Liliaceae Streptopus amplexifolius; and the Saxifragaceae Saxifraga careyana.