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

Florida crayfish

Florida crayfish


LatinProcambarus alleni
Size10 cm
FoodCrayfish are omnivores that feed on carrion , plants , etc.
HabitatSwamps and rivers.

Least concern


Changes skeleton

As crayfish grows, they change their shell. To get minerals they often eat their old shell.

Male or female?

If you want to know the sex of a blue crayfish, you have to look at its claws. The males have longer and thinner claws than the females.

Hides its eggs

The female blue crayfish carries her eggs under her tail where they are well protected. If you’re lucky, she may even have some eggs now. Perhaps you can see the eggs or the little babies swimming along the bottom of the aquarium?

Babies fend for themselves

As soon as the baby crayfish hatch and let go of the tail of the female crayfish, they are able to take care of themselves and set off to explore the world.


At the National Aquarium Denmark, Den Blå Planet, we breed our own blue crayfish in special breeding tanks which are not on display.



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