Fish do rest, but it's different from how mammals like humans sleep. Fish are not known to sleep in the way humans do with distinct sleep cycles. Instead, many fish exhibit periods of reduced activity or rest.
Some fish may rest in sheltered areas, such as coral reefs, caves, or underwater structures, where they can find protection from predators. During these periods of rest, they may slow down their movements, hover in place, or find a secure spot to minimize energy expenditure.
Fish need to remain alert to avoid predators and catch prey, so their "rest" is more of a passive state where they remain somewhat aware of their surroundings. Some fish, like certain reef fish, may even have one eye "open" while resting, allowing them to keep watch for danger.
The resting behavior of fish can vary among species, and it's adapted to their specific ecological niche and survival strategies. So, fish do have their own way of resting or being less active in the ocean, but it's quite different from the sleep patterns of mammals.
Fish do sleep, but their sleep patterns and behaviors differ from those of mammals. Most fish do not have eyelids, so they do not close their eyes while sleeping. Instead, they may enter a state of reduced activity and responsiveness, finding shelter in the water column or among structures. Some fish even have specialized behaviors or physiological adaptations to facilitate sleep, such as finding protected areas or slowing down their metabolic rate. However, it's important to note that sleep in fish is still an area of ongoing scientific study.