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The fish's common name, cardinal tetra, refers to the brilliant red coloration, reminiscent of a cardinal's robes. P. axelrodi is also often called the red neon tetra. The species exists in a number of different color forms or phenotypes. A "gold" and "silver-blonde" form exists in the Rio Negro drainage that has less blue in the longitudinal ...
During the 1940s and 1950s, White Cloud Mountain minnows acquired the nickname, the "Poor Man's Neon Tetra", because they were much more affordable in price than the colorful and then expensive neon tetras. [9] Two variants are commonly available: the "Golden Cloud" and the longer-finned "Meteor Minnow", which can be gold as well.
The rummy-nose tetra (Petitella rhodostoma) is a species of tropical freshwater characin fish originating in South America, popular among fishkeepers as a tropical aquarium fish. [2] One of many small tetras belonging to the same genus, it is on average 5 cm (2 in) long when fully grown. [ 3 ]
The gold tetra, or Rodway's tetra [1] (Hemigrammus rodwayi) is a species of small freshwater fish in the family Characidae native to lowland South America, [2] where they are abundant in coastal floodplains. [3] Their name comes from a powdery golden tint on their body that is thought to be caused by internal parasites. [4]
The name of the project comes from the Brazilian Portuguese word, piaba, which means "little fish", [1] referring specifically to the cardinal tetra (Paracheirodon axelrodi). [2] Project Piaba is an ongoing project with annual research expeditions to the Rio Negro region. [ 2 ]
Carlastyanax aurocaudatus is sometimes known as the gold-tailed tetra. [1] [10] In fact, its specific epithet means "gold tail"; "auro-" is "gold", and "caudatus" is "tail".". The genus name "Carlastyanax" is to honor Carl H. Eigenmann and the original genus to which C. audocaudatus once belonged, Astya
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.
The green neon tetra (P. simulans) and black neon tetra (Hyphessobrycon herbertaxelrodi) are distinct species—the latter belongs to a different genus—and not color varieties. The cardinal tetra (P. axelrodi) is also a similar species, but its greater extent of red coloring distinguishes it from the neon tetra. [28]