Photo by Brian Skerry brianskerry | A pair of Atlantic bluefin tuna, each weighing perhaps 1,000 pounds, swim in the chilly waters of Canada's Gulf of St. Lawrence. Bluefin possess incredible biology. They continue to grow their entire lives, swim faster than torpedoes, crisscross the ocean each year, and generate heat in their bodies, allowing them to swim into cold waters to feed. Revered for centuries, their stocks have now dwindled. Follow BrianSkerry to see more wildlife in the sea and to read the stories behind the photos.