Many freshwater fishes are also popular as food.
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Freshwater fish used as food in many parts of the world.
A group of fish characterised by a cartilaginous skeleton, well-known species include the great white shark and the great hammerhead shark.
This bizarre-looking fish uses its bioluminescent lure to catch its prey. The animation explains how it works.
A type of large freshwater crayfish widespread in Europe.
A species of mollusc widespread in freshwaters.
Blood vessels in fishes' gills absorb oxygen and release carbon dioxide.
In ecology, a niche is a term describing the way of life of a species.
Extinct species of fish which had thick ´armour´ protecting the head.
Cosmopolitan monocots inhabiting watersides.
Living fossil, important stage in the evolution of tetrapods.
This animation demonstrates the anatomy of amphibians through the example of a common species of frogs.