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Saltwater Fish Health and Disease (page 5)
Most Frequently Asked Question: DO FISH SLEEP?
The majority of 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 to avoid being eaten at night. The resting behavior of fish is very different from their behavior the
remainder 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 need to keep moving to push water through their mouths
in order to breathe, and they may still sleep while moving, it's just not known yet.
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