There are a few species of sharks that will feed on the sick, the injured, and the young. Their only other predator are Orcas, the killer whale and we rarely see Orcas here since they prefer colder waters. In away I would say it is because they could not make a living here. You see, the long summer days in Alaska provide plenty of hours of sunshine for photosynthesis. An important step in producing the Humpback's food.
Humpbacks feed on small schooling fish and krill.
Because of our location, our waters are relatively nutrient free and too warm to produce enough food to sustain them year round. They must leave to feed and rebuild their blubber supply. About The Humpback Whale. Humpback Wales have very efficient lungs. Their lung size is also quiet large being the size of a compact car.