Cardinal tetra
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The cardinal tetra is a species of freshwater fish of the family Acestrorhamphidae, the American characins, of order Characiformes. It is native to the upper Orinoco and Negro Rivers in South America.
Cardinal Paracheirodon axelrodi
The cardinal tetra (above) has more red on the underside than the superficially similar neon tetra (below).
A shoal of cardinal tetras in an aquarium
Tetra
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Tetra is the common name of many small freshwater characiform fishes. Tetras come from Africa, Central America, and South America, belonging to the biological families Characidae, Alestidae, Lepidarch
Cardinal tetra
…characteristic of the genus Paracheirodon laterally bisecting the fish, with the body below this line being vivid red in color, hence the name "cardinal tetra". The cardinal tetra's appearance is similar to that of the closely related neon tetra, with which it is often confused; the neon's red coloration…
Schmucksalmler Hyphessobrycon bentosi
Black neon tetra, Hyphessobrycon herbertaxelrodi
Pristella tetra, Pristella maxillaris
Golden pristella tetra, a morph of Pristella maxillaris