Bright Side of the Night – 2.2.5

Fishes

There are nocturnal and diurnal fish species. Many, however, are particularly active at dusk and dawn. At night, predatory fish such as zander, eel and pike are often on the move. For fishes, some life processes are light-dependent, including hatching for instance.

European Perch

The European perch (Perca fluviatilis) is distributed throughout Europe, mostly Central and Northern Europe. This species adapts easily to different habitats, such as rivers or lakes, and prefers to hunt at dusk. Perch adults spawn between March and June via so-called “spawning tubes”.

European Eel

The European eel (Anguilla anguilla) is an extraordinary and unfortunately endangered crepuscular and nocturnal fish. Eel have an outstanding sense of smell and also a sense of magnetism. They are found in parts of Europe, Asia Minor and North Africa. They spawn, hatch, and die in the Sargasso Sea in the Atlantic Ocean, near the Bahamas. From there, the larvae take about three years to reach Europe’s coasts. In spring, young eel can sometimes be seen moving in large shoals from the coast upstream into the inland waters of the continent. There, they grow to full size. Females reach sexual maturity when they are 12 to 15 years old. To spawn, eel migrate from the inland waters via the rivers back to where they hatched. Eel have been observed covering distances of over 5,000 kilometres against the Gulf Stream for a whole year, and without feeding. They can also travel considerable distances over wet land because they can absorb the vital oxygen through their skin. Eels can reach an age of 50 to 80 years, in individual cases even well over 100 years, especially if they have no possibility to migrate.

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*European perch – Image by Gilles San Martin – flickr*

*European eel – Image by fotoblend – Pixabay*

Further Resources

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Images

A vast number of photos of fishes can be accessed at Pixabay