Did you know that there are sharks that doesn’t mind hot, acidic seawater with bubbles of carbon dioxide and methane around underwater volcanoes (albeit inactive)? This pacific sleeper shark has been filmed near Kavachi, one of the most active underwater volcanoes in the southwest Pacific Ocean.
Living normally as far as 2,773 meters deep in the North Atlantic, the North Pacific and around Antarctica, pacific sleeper sharks developed methods to adapt to the frigid depths, like trimethylamine oxide instead of urea in their skin as natural antifreeze and to counteract the protein-destabilizing effects of (deep sea) pressure and diacylglyceryl ethers and triacylglycerol instead of squalene in their liver which maintain their fluidity even at the lowest temperatures. And yet, one of them seems to like it hot.
Pacific sleeper shark can reach lengths of up up to 4.4 m (14 ft) and are known to feed on bottom animals such as fishes, octopi and squids like the much bigger giant pacific octopus and giant squid, crabs and tritons, but also seals and carrion.