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Other common names include goldfinch tetra, a reference to the similarly coloured goldfinch, and pristella tetra, a modification of its Latin name. A common name that was once widespread but is now rarely used is signal tetra, a reference to the similarity between the yellow and black dorsal fin and the arm of a semaphore railway signal.
Thayeria boehlkei is a species of characin fish endemic to the Amazon River basin and Araguaia River, in Peru and Brazil respectively. [2] The species is popular with aquarium hobbyists where it is traded under a variety of common names including blackline penguinfish, blackline thayeria, hockey-stick tetra, penguin fish and penguin tetra.
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.
Penguin tetras are commonly found in fish stores and are available from online retailers, they require at least 20 US gallons of swimming area, and will typically grow to around 3 inches. These fish are known for their atypical swimming position that has them swimming at a slight upright angle, and will inhabit the top and middle regions in ...
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 ...
Characidae, the characids or characins, is a family of freshwater subtropical and tropical fish belonging to the order Characiformes.The name "characins" is a historical one, [2] but scientists today tend to prefer "characids" to reflect their status as a, by and large, monophyletic group (at family rank).
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Hemigrammus erythrozonus, commonly known as the glowlight tetra, is a small tropical fish from the Essequibo River, Guyana, South America.It is silver in colour and a bright iridescent orange to red stripe extends from the snout to the base of its tail, the front of the dorsal fin being the same color as the stripe.