Why do some fish glow in the dark?

Some fish glow in the dark due to bioluminescence, a chemical reaction that occurs in specialised cells called photophores. This light is produced by the interaction of luciferin, an organic molecule, and luciferase, an enzyme. Bioluminescence helps fish attract prey, communicate, or evade predators by creating confusion or mimicry. Deep-sea species, like the anglerfish, use glowing lures to attract unsuspecting prey in the pitch-black ocean depths. This adaptation is a remarkable survival tool in low-light marine environments.