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  • One must be a fox in order to recognize traps, and a lion to frighten off wolves. Machiavelli Niccolo
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Swim with a School of Fish

COMPLETED BY 30

LISTED 90

In biology, any group of fish that stay together for social reasons are shoaling , and if the group is swimming in the same direction in a coordinated manner, they are schooling. In common usage, the terms are sometimes used rather loosely. About one quarter of fish species shoal all their lives, and about one half shoal for part of their lives.

Fish derive many benefits from shoaling behaviour including defence against predators (through better predator detection and by diluting the chance of individual capture), enhanced foraging success, and higher success in finding a mate. It is also likely that fish benefit from shoal membership through increased hydrodynamic efficiency.

Fish use many traits to choose shoalmates. Generally they prefer larger shoals, shoalmates of their own species, shoalmates similar in size and appearance to themselves, healthy fish, and kin (when recognized).

The "oddity effect" posits that any shoal member that stands out in appearance will be preferentially targeted by predators. This may explain why fish prefer to shoal with individuals that resemble themselves. The oddity effect would thus tend to homogenize shoals.

 

Success stories

Fabiana van der Heiden

Apr 16 at 20:01 pm
To be completely surrounded by silver is astonishing. Off the coast near Exmouth in Australia was my biggest school of fish.

Kev

Jan 02 at 16:18 pm
gbr

Soph Mastema

Dec 24 at 23:33 pm
Great Barrier Reef, Australia

Billie Andrews

Dec 06 at 23:30 pm
in Bora Bora Amazing