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Cichlids are fish from the family Cichlidae in the order Perciformes. The family Cichlidae, a major family of perciform fish, is both large and diverse. There are at least 1300 scientifically described species, making it one of the largest vertebrate families. Numerous new species are discovered annually, and many species remain undescribed. The actual number of species is therefore unclear, with estimates varying between 1300 and 3000 species, and one source suggesting 1900 species. Cichlids span a wide range of body sizes, from species as small as 2.5 centimetres (1.0 in) in length to much larger species approaching 1 metre (3 ft) in length .As a group, cichlids exhibit a similarly wide diversity of body shapes, ranging from strongly laterally compressed species through to species that are cylindrical and highly elongate. Generally, however, cichlids tend to be of medium size, ovate in shape and slightly laterally compressed, and generally very similar to the North American sunfishes in terms of morphology, behaviour, and ecology.

Many cichlids, particularly the tilapias, are important food fishes, while others are valued game fish. Many species, including the angelfish, oscars, and discus, are also highly valued in the aquarium trade. Cichlids are also the family of vertebrates with the largest number of endangered species, most of these found in the haplochromine group. Cichlids are particularly well known for having evolved rapidly into a large number of closely related but morphologically diverse species within large lakes, particularly Tanganyika, Victoria, Malawi, and Edward. The diversity of cichlids in the African Great Lakes is important for the study of speciation in evolution. Many cichlids that have been accidentally or deliberately released into freshwaters outside of their natural range have become nuisance species, for example tilapia in the southern United States.

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http://pet-animal-cichlid.blogspot.com/



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