They are the largest bony fish in the world, which can measure up to 2.7 m and weigh up to 2 tonnes Pelagic species, solitary and calm. In the water column, they inhabit from the surface to a depth of 480 metres. On the surface, they are often seen basking in the sun (to warm up), even jumping out of the water (to get rid of parasites). They feed on jellyfish, crustaceans, cephalopods, small fish and zooplankton.