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The surface and cave forms of the Mexican tetra have proven powerful subjects for scientists studying evolution. [28] When the surface-dwelling ancestors of current cave populations entered the subterranean environment, the change in ecological conditions rendered their phenotype—which included many biological functions dependent on the presence of light—subject to natural selection and ...
Many fish can be kept with rummy-nose tetras, some including smaller gourami, other tetras, barbs, danios, Australian rainbows, and various catfish, such as Ancistrus. The rummy-nose tetra cannot be kept with other popular ornamental fishes, such as African cichlids, as they require very different water parameters.
The African jewelfish needs slightly acidic water (generally pH 6.0–7.8) and warm water (72–82 °F or 22–28 °C) in order to thrive in captivity. [3] Because of the aggressive territorial behavior, it is often recommended keeping the species alone, but in large aquariums they can be kept with Congo tetras, Synodontis catfish and other robust species. [3]
The firemouth cichlid (Thorichthys meeki) is a species of cichlid fish native to Central America. They occur in rivers of the Yucatán Peninsula, Mexico, south through Belize and into northern Guatemala. Vancouver Aquarium Fighting. Their natural habitat is typically shallow, slow-moving, often turbid, water with a pH of 6.5 - 8.0. It has also ...
The black tetra is also known as the black skirt tetra. The female black tetra is more robust and larger than the male. [29] Black morpho tetra: Poecilocharax weitzmani: 4 cm (1.6 in) Bleeding heart tetra: Hyphessobrycon erythrostigma: 6.5 cm (2.6 in) The bleeding heart tetra is distinguished by the small red spot on both sides of the fish.
In many cases, the eggs are dependent on the male for oxygen and nutrition so these fish can be further defined as viviparous livebearers. [citation needed] Many cichlids are mouthbrooders, with the female (or more rarely the male) incubating the eggs in the mouth. Compared with other cichlids, these species produce fewer but bigger eggs, and ...
The redeye tetra (Moenkhausia sanctaefilomenae), is a species of tetra from the São Francisco, upper Paraná, Paraguay and Uruguay river basins in eastern and central South America. [ 2 ] [ 3 ] This freshwater fish is commonly kept in aquariums and bred in large numbers at commercial facilities in Eastern Europe and Asia. [ 4 ]
Geophagus is a genus of cichlids that mainly live in South America as far south as Argentina and Uruguay, but a single species, G. crassilabris is from Panama. [1] [2] They are found in a wide range of freshwater habitats. [3]
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