This very rare deep-sea fish is often referred to as the 'fish of fate' because it is believed that its appearance can be a harbinger of natural disasters. The fish called Regalecus glesne is sometimes called 'the king of the herring'. It is a fascinating and mysterious fish that is among the longest bony fish in the world. They live in the deep waters of the oceans, usually at depths of 200 to 1000 meters, but they can be found even deeper. They are solitary fish that spend most of their lives at great depths, which makes it difficult to observe and study them. They rarely reach shallower water or the surface. They feed mainly on zooplankton, small crustaceans, fish larvae and jellyfish. Their long and narrow body is adapted for slow movement, relying on vertical movements to find food in the water column. They are passive hunters who do not put much effort into the pursuit of prey. These fish were often associated with marine legends and myths about giant sea serpents. Japanese mythology, for example, connects this fish with earthquake prediction, but scientific evidence for such a connection is lacking.