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Some of these fish, like many of their relatives, are kept as aquarium pets and known collectively as tetras. With around 150 described species and new ones being described yearly, [2] this genus is among the largest of the entire order; Hyphessobrycon also has more than 145 species and which one is larger at any one time depends on whether ...
The neon tetra (Paracheirodon innesi) is a freshwater fish of the characin family (family Characidae) of order Characiformes. The type species of its genus, it is native to blackwater and clearwater streams in the Amazon basin of South America.
The tetra is a tropical, silver metallic-colored fish, with red-tipped fins and a black marking on the dorsal fin. The tetra is a hardy community fish for beginners, and is optimal for the beginning fish hobbyist. [4] It is also relatively large for a tetra, growing up to 7.5 cm (3 inches). [4] They can live up to 5 or 6 years.
Tetras are many species of freshwater tropical fish in the characin family or in the African tetra family of order Characiformes. Not all characins are called tetras; this category includes only those fishes commonly called tetras.
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 ...
Hyphessobrycon columbianus (Colombian tetra or blue-red Colombian tetra) is a species of Tropical freshwater fish of the characin family. The Colombian tetra is native to the Acandi River near Acandí) in northwestern Colombia. The Colombian tetra's habitat tends to be slow-flowing creeks and tributaries.