Words from @maestro320: "Toothfish On The Menu" - 🔵Maestro's Notes: This incredible footage was filmed on location in the Ross Sea Marine Protected Area courtesy of Marine Scientist, Dr. Regina Eisert confirming that toothfish are indeed part of an Orca's diet. The astonishing footage shows the young mammal headbutting marine expert Regina Eisert's camera, described as a "whale selfie stick." The Orca then opens its mouth and chews on some toothfish before swimming away. This video was shot during an expedition in the Ross Sea region Marine Protected Area earlier this month. Eisert, who is based at the University of Canterbury in New Zealand, was standing by the edge of the sea ice, collecting samples, when she was approached by the whale. • Fish-eating killer whales prey on around 30 species of fish. Some populations in the Norwegian and Greenland sea specialize in herring and follow that fish's autumnal migration to the Norwegian coast. Salmon account for 96% of northeast Pacific residents' diet, including 65% of large, fatty Chinook. Chum salmon are also eaten, but smaller sockeye and pink salmon are not a significant food item. Depletion of specific prey species in an area is, therefore, cause for concern for local populations, despite the high diversity of prey. On average, a killer whale eats 227 kilograms (500 lb) each day. While salmon are usually hunted by an individual whale or a small group, herring are often caught using carousel feeding: the killer whales force the herring into a tight ball by releasing bursts of bubbles or flashing their white undersides. They then slap the ball with their tail flukes, stunning or killing up to 15 fish at a time, then eating them one by one. Carousel feeding has only been documented in the Norwegian killer whale population, as well as some oceanic dolphin species. In New Zealand, sharks and rays appear to be important prey, including eagle rays, long-tail and short-tail stingrays, common threshers, smooth hammerheads, blue sharks, basking sharks and shortfin mako sharks. With sharks, orcas may herd them to the surface and strike them with their tail flukes.