>> if we can figure out how these corals cope with the conditions here, it might help us to protect marine life in other parts of our rapidly changing world. but these creatures are in danger for a familiar threat. >> when i arrived, there were three small salmon farms, and the fjord was near pristine. nowadays there are more than 20 farms, and they are much, much bigger than before. >> contamination from fish farms has led to bigger and more frequent algae blooms. and after dying off, the decomposing blooms suck oxygen from the water, leaving less for marine life. boat traffic has also increased here. there's more trash, more lost fishing lines and nets.