Large marine predators including great white sharks regularly spend time in the ocean's twilight and midnight zones, far beneath the depths at which they feed, in a discovery that has mystified scientists.
In a new study, data from 12 species of large predatory fish, including sharks, billfish and tunas showed they regularly spent time in the mesopelagic zone — also known as the twilight zone —. which stretches between the depths of 656 and 3,280 feet (200 to 1,000 meters). They were also seen in the midnight zone, 3,280 to 9,800 feet (1,000 to 3,000 m) beneath the ocean surface.
