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The cardinal tetra is a very popular aquarium fish, but is less widespread than the neon tetra because until recently, it was difficult to breed in captivity. However, many breeders are now producing the fish; in most cases, one can determine if the cardinal tetra is bred or wild-caught due to damaged fins on wild-caught specimens.
Common names of fish can refer to a single species; to an entire group of species, such as a genus or family; or to multiple unrelated species or groups.Ambiguous common names are accompanied by their possible meanings.
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 ]
Paracheirodon tetras reach maximum overall lengths of 2.5 to 5 cm (0.98 to 1.97 in) depending on the species, and are of elongated, tetra shapes. All share a distinctive iridescent blue lateral line, but differ slightly in their other colorations.
In fact, several species, including cardinal tetras, show the adaptive trait of iridescence which may provide lower visibility in a blackwater environment. [ 4 ] Project Piaba started with an ecological baseline study of the region which was conducted in 1989 by a group of researchers and students from the Universidade do Amazonas (UA) and the ...
Cardinal tetra: Paracheirodon axelrodi: 5 cm (2.0 in) Similar to the Neon Tetra, but slightly larger and doesn't prefer to school as much. They need much larger tanks, although their temperament is similar. [31] Cave tetra, blind tetra: Astyanax mexicanus: 12 cm (4.7 in) The cave tetra is the blind cave form of the Mexican tetra.
The cardinal tetra, Paracheirodon axelrodi, was named for Axelrod. For his philanthropy, the Smithsonian Institution named Axelrod their 1999 Donor of the Year. [15] Axelrodia, a genus of characin from South America, is named for him. [2] A number of fish species are also named for him, including
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 ]