Our animals

Select zone

Northern lakes and seas

The ocean

Tropical rivers and lakes

Select aquaria

Dwarf mormyrid

Electric eel

Cave tetra

The flooded rainforest


The interesting species of the river

Select species

Select a species to read more

Cardinal tetra

Cardinal tetra

Neon tetra

Neon tetra

Green neon tetra

Green neon tetra

Iguazu Pleco

Iguazu Pleco

Florida crayfish

Florida crayfish

Worm line peckoltia

Worm line peckoltia

Cardinal tetra

Cardinal tetra


LatinParacheirodon axelrodi
Size3.5 cm
FoodSmall crustaceans, insects and worms
HabitatForest streams and tributaries with dark water

Not evaluated

LocationThe Negro and Orinoco basins of the Amazon, South America

Reflections in the dark

The beautiful cardinal tetra does not produce light, but it does reflect sunlight with its scales. Although not much sunlight penetrates through the water, this light reflecting is still possible. The cardinal tetra's way of reflecting light can be compared with the way that a cat's eyes light up in the dark.

Colours confuse its enemies

One might think that strong colours that light up would make the cardinal tetra an easy prey. But in a dark stream, the cardinal tetra's colours confuse its enemies. Only the fish's stripes can be seen and not the outline of the fish.

Sponsor of the cardinal tetra



Stream aquarium

Under the riverbank

South America's rainforest

The plants in the river

River deep

Armored predators

Conservation of species

California kingsnake

River pool


Endangered species

Lake Tanganyika

Lake Malawi