Coelacanths are believed to be primarily nocturnal, which means they are most active during the night. Their nocturnal behavior is thought to be an adaptation to their deep-sea habitat, where light levels are low or absent.
During the day, coelacanths are often observed resting in underwater caves or rocky crevices to avoid predators and conserve energy. At night, they are more likely to venture out in search of prey, taking advantage of the bioluminescent organisms that inhabit the deep-sea environment. Their nocturnal behavior helps them avoid potential predators and exploit the availability of food sources that are more active at night.