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Marine Life

Do fish sleep?

By spotmydive
2016-11-11
featured

Yes fish are sleeping

Fish do not have eyelids that is why it is very difficult to realize that fish are actually sleeping! Sleep is vital for all living species, fish are no exception to the rule. To protect themselves from predators, fish adopt defensive strategies that vary for each species:

Rays bury themselves in the sand

Rays bury themselves in the sand

Other fish hide under stones or caves

Triggerfish are sleeping between rocks and opens their “trigger” fins up. Thanks to this, they can stand still even with rough sea or if something is trying to grab them.

Triggerfish sneak under rocks

Some coral reef fishes change color at night to be less seen

puffer fish sleep on corals

Parrotfish covers its body with a protective mucus

If something breaks the its bubble it alarms the parrotfish that something is wrong and awake him

parrot fish

Some fish swim while sleeping

Some fish continue to swim while sleeping, such as mackerel or shark. Sharks, to breathe must swim permanently to filter the oxygen contained in the water.

shark sleep while swimming

Mammals sleep on the surface of the water

Finally, dolphins and whales remain on the surface of the water during their resting phases. To be able to breathe regularly, whales sleep with half of their brain active.

whales sleep on the surface

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All comments

  • Turner James
    2020-05-16

    Oui les poissons dorment sous l’eau, c’est incroyable à observer. Si vous avez la possibilité essayé une plongée de nuit.

  • Mickael Finey
    2020-05-16

    It remind me my first night dive when I discovered that fish are actually sleeping ! Thank you for those examples.

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