How do fish sleep?

I get this question a lot. They don’t have eyelids… how do they sleep?

If you’ve seen people sleeping with their eyes open, then you’re halfway there.

This is how (pictured below):

They stay still, moving their fins intermittently, to maintain their position in the water.


Yours sincerely,

Dr Richmond Loh
DipProjMgt, BSc, BVMS, MPhil (Pathology) Murdoch, MANZCVS (Aquatics& Pathobiology), CertAqV, CMAVA, NATA Signatory.
THE FISH VET, Perth, Western Australia.
Veterinary Medicine for fish.
W: http://www.thefishvet.com.au
E: thefishvet
P: +61 (0)421 822 383

2014 President WAVMA.org

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