1471439 story Warm-blooded Fish? 342 Posted by Hemos on Monday October 31, 2005 @10:07AM from the sounds-mighty-fishy-fishy-har-de-har dept. DIY News writes "Scientists now have direct evidence that the north Pacific salmon shark maintains its red muscle at 68-86 degrees Fahrenheit, much warmer than the 47 F water in which it lives. The elevated muscle temperature presumably helps the salmon shark survive the cold waters of the north Pacific and take advantage of the abundant food supply there. The heat also appears to factor into the fish's impressive swimming ability."