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Koi and many other species of fish tend to sink to the bottom of the water or sometimes rest on some structure in the water and appear to doze or go into a kind of trance like state. Fish do not have eyelids so they can not shut their eyes as we do. They are never far from waking in an emergency or if danger threatens.

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15y ago
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14y ago

yes and no. they sleep but do not close their eyes because they obviously don't have any eyelids.

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Q: Do koi fish sleep
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