Do fish sleep? If so, how?

Most all fish spend time in an energy-saving state that can be called
“rest”, and we might even call their behavior “sleep”, though it is probably
different than “sleep” in most land
animals. Many fish, like Bass and perch, rest on or under logs at
night. Coral reef fish active in the day, hide and rest in crevices
and cracks in the reef to avoid being eaten at night.
The resting behavior of fish is very different from their behavior the
rest of the day. Many minnows, for example, which are very active in
schools during the day, scatter and remain motionless in shallow
water at night. Many fish “rest” or “sleep” during the day and are
active at night instead, but almost all fish sleep.
There are some animals that never stop swimming, like many species of
shark, however, they HAVE to keep moving to push water through their mouths
in order to breathe, and they may still sleep while moving,
we just don’t know yet.

@cooldil: wow, that was cool! How do you know all that?

Maybe he read it hear

@Bulbatron9: Well, yes you caught me, I probably should of listed my source! But the point of the matter is yes they do!

On a side note: Some sharks have been known to actually sleep on the ocean floor next to caves where water rushes past their gills without having to swim through the water. I believe I read this in one of my mom’s old National Geographic Magazines.

Great catch bulbatron!