Ask anything.
Do fish sleep?
Yes, fish do sleep, but their eyes stay open because most fish don't have eyelids.
Fish need rest, just like we do. But they can't lie down and close their eyes like people can. Most fish don't have eyelids, so their eyes always look open, even while they sleep.
When fish sleep, they move more slowly, their breathing settles into a steady rhythm, and they react less to sounds around them. Some fish rest by hiding under rocks, in the sand, or among plants. This keeps them safe while they rest.
Some fish never stop swimming, even while asleep — they just swim slowly. Some kinds, like the parrotfish, wrap themselves in a cover made of mucus at night and rest safely inside it.
Quick facts
- Most fish don't have eyelids, so their eyes stay open while they sleep.
- When fish sleep, their movements and breathing slow down.
- Some fish rest by hiding under rocks or in the sand.
- The parrotfish wraps itself in a protective cover made of mucus at night.
- Some sharks must rest while swimming so water can pass through their gills.
Check what you remember
3 questions — all of them come from the quick facts above. There is no score and no wrong turn.
1. Why do most fish's eyes stay open while they sleep?
2. What does the parrotfish do at night?
3. Why must some sharks rest while swimming?
Where this comes from
-
-
2 tr.wikipedia.org 80/100Fish - Wikipedia
General and reliable information about fish can be found here.
-
3 oceanservice.noaa.gov 75/100NOAA Ocean Service
Offers official and accurate information about sea creatures.
ReKid™ is not just a search
- The answer to the question is checked for accuracy before it is shown
- An age-appropriate explanation of the topic, written to be read
- A set of short facts about the topic
- A set of short facts on subjects connected to the topic
- A short quiz built from the topic, the facts and the connected facts
- Up to five safe recommended links about the topic
- PDF export, and every topic searched is kept
- Everything from earlier keys carries over to a new key, complete
- No advertising
- No tracking
- A knowledge support set that needs no personal account