Question

Do fish ever blink?

Answer 1

Hello friend

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yes! They are sleeping, and they can sleep at any time during the day or night. Fish do sleep with their eyes open, because they don't have eyelids (except for some sharks) to close!
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Hope it helped u

Answer 2

Obviously fish didn't blink because as they lives underwater so as to protect themselves from their dangers. As fish do not have eyelids , as if they sleep too their eyes are open.