Species group · Bony fish
WAnimals has 2 species of tetra, in the family Characidae.
Ranges calculated from the profiles that record the figure, not from all 2.
Each one has its own full profile. This group does not replace them: it brings them together.
No species documented in this group is genuinely at risk according to the IUCN, with the data available today.
Recorded in 12 countries. The ones with the most species in the group:
One of the most exported aquarium fish in the world, out of the Amazon.
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It is told apart from the neon tetra because the red band runs the whole length of its body, from nose to tail, and not just the rear half.
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It is the most important ornamental fish on the world market: it accounts for more than 80% of all aquarium fish exported each year from the Rio Negro.
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Its blue stripe is not a pigment but a structure: reflective cells holding plates of guanine crystals that split the light, and the fish can change their angle, so the colour fades at night or when it is unwell.
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In the gloom of the blackwater streams that stripe works as a recognition signal that holds the shoal together.
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It is one of the most heavily traded ornamental fish on the planet, today bred almost entirely on farms in South-East Asia.
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