Sort of. Most fish don’t hunker down under a rock and do what we call “sleeping,” but many do enter a phase of energy-saving rest, often at night…though some fish will rest during the day and be more active at night. It depends based on the species. In general, though, fish do rest in a manner that we would liken to sleeping.
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 landanimals. Many fish, like Bass and perch, rest on or under logs atnight. Coral reef fish active in the day, hide and rest in crevicesand cracks in the reef to avoid being eaten at night.The resting behavior of fish is very different from their behavior therest of the day. Many minnows, for example, which are very active inschools during the day, scatter and remain motionless in shallowwater at night. Many fish "rest" or "sleep" during the day and areactive at night instead, but almost all fish sleep.There are some animals that never stop swimming, like many species ofshark, however, they HAVE to keep moving to push water through their mouthsin order to breathe, and they may still sleep while moving,we just don't know yet.
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