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Male swordtails in the genus Xiphophorus display a conspicuous ventral elongation of the caudal fin, the sword, which arose through sexual selection due to female preference.
For example, in swordtails , male - male competition and female choice both contribute to the greater reproductive success of larger males.
Many fish lay eggs, but some - including common aquarium fish such as guppies, swordtails , and mollies - retain the eggs inside their bodies until hatching.
An examination of correlations between parameters of growth in multiple species of swordtails points to several possible targets of selection.
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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