Scientists discovered the world's first warm blooded fish

        U.S. researchers said 14, living in the deep sea fish is the first systemic warm blooded hitherto known fish in the world, they are like mammals and birds that have warm blood circulating in the body, the ability to adapt to make them have a survival advantage in the deep sea.
        According to the report published in the latest issue of the U.S. "science" magazine, in the global distribution of major marine fish are, they usually live in cold water for hundreds of meters deep, dark, adult size have automobile tires so big. Although some fish such as tuna and sharks have some organ or muscle temporarily becomes hot in the pursuit of prey, but only opah body than the outside environment of high temperature throughout the year about 5 degrees Celsius, they get a lot of heat by using its pectoral fins.
        Responsible for the research of the National Oceanic and Atmospheric Administration fisheries biologist Nicholas Wegner said, live action usually in deep-sea fish predation is slow, save heat rather than chase take ambush, but you are warm blooded fish, its metabolism, movement and reaction speed is very fast, the vision is better, so it is a very efficient predator.
        "My previous impression was that it was a sluggish fish, just like other fish living in cold water," Wegener said in a statement. But it heats the body and turns out to be a very active predator that can prey on nimble prey such as squid and migrate far distances."
        According to Wegener et al. Opah by counterflow heat exchange radiator similar way to keep warm. Their pectoral fins in arteries (the heart to the body) and vein (the body to the heart) stacked together, which can exchange heat by using its pectoral fins obtained blood heat to obtain oxygen in the surface circulation after artery blood to heat the cold. In addition, their pectoral fin, heart and muscle have a layer of fat, also can reduce the loss of heat insulation.