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Aggression is an important evolutionary pressure that increases an individual's access to resources while reducing overall conflict within the social group. [2] Fish use aggressive behaviors to defend a territory, establish dominance, appeal to potential mates, and protect their young.
Xiphophorus pygmaeus, the pygmy swordtail, is a poeciliid fish from northeastern Mexico. It is the smallest of the swordtails. The male's sword is barely visible and the species is often called the swordless swordtail. It is sometimes kept in home aquaria, but is a rather delicate species.
Xiphophorus is a genus of euryhaline and freshwater fishes in the family Poeciliidae of order Cyprinodontiformes, native to Mexico and northern Central America. Xiphophorus species can be divided into 3 groups based on their evolutionary relationships: platyfish (or platies), northern swordtails, and southern swordtails.
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Xiphophorus cortezi, the delicate swordtail, is a species of poeciliid fish from Mexico. [2] Named after the Spanish conquistador Hernán Cortés, Xiphophorus cortezi was originally described in 1960 by Donn Eric Rosen as a subspecies of X. montezumae. It was well known in literature prior to the formal scientific description.
Xiphophorus nigrensis, the Panuco swordtail, is a species of fish in the family Poeciliidae [2] that is endemic to a small part of the Pánuco River basin in Mexico. [ 1 ] [ 3 ] [ 4 ] Taxonomy
Xiphophorus malinche, also known as highland swordtail, is a live bearing fish in the family Poeciliidae. [2] It is endemic to the Pánuco River basin in east-central Mexico. [ 3 ] This species is named after La Malinche , an Indian slave who played a role in the Spanish conquest as the interpreter, secretary, and mistress of Hernán Cortés .
A male swordtail. The male green swordtail grows to a maximum overall length of 14 centimetres (5.5 in) and the female to 16 centimetres (6.3 in). The name 'swordtail' is derived from the elongated lower lobe of the male's caudal fin (tailfin). Sexual dimorphism is moderate, with the female being larger than the male, but lacking the 'sword'.