A live-bearing freshwater fish of Central America, popular in aquaria. The lower edge of the tail is elongated and brightly marked in the male.
- Xiphophorus helleri, family Poeciliidae.
- Many fish lay eggs, but some - including common aquarium fish such as guppies, swordtails, and mollies - retain the eggs inside their bodies until hatching.
- Such video techniques have been particularly effective in female mate choice studies in fishes, including guppies, sticklebacks, and swordtails.
- Poeciliids, namely guppies and swordtails, are favorite subjects of sexual selection studies, in particular those concerning mate choice and its role in the maintenance of male secondary sex traits.
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