MadSci Network: Zoology

Re: Do fish sleep?

Area: Zoology
Posted By: Bruce Woodin, Staff Biology. Woods Hole
Date: Tue Apr 9 10:18:14 1996

Fish do have a quiescent period which can be called 'sleep'. Tropical freshwater fish in home aquaria can be observed resting immediately after turning the lights on in a room which has been darkened for several hours.

Because of the nature of their eye (lacking an eyelid), they do not 'close' their eyes when they are sleeping.

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