Their ear is impossible to find because it is in a chamber on either side of its head. Fish can hear sounds under the water pretty well but out of the water they have very little hearing. The trunk is in the middle of the fish and holds the meat and internal organs. The pelvic fin is in the trunk area as are the pectoral fin and the dorsal fin. The tail is the most important part of the body because it allows the salmon to swim.
Fins help the king salmon move by pushing the water.
The fin is a movable structure that helps a fish swim and keep it balanced. A fish moves its fins by means of muscles. A salmon's caudal fin is on the back of the fish, and helps it swim when the fish flicks its tail. A salmon is covered on the outside with scales . Scales are made of blood vessels, nerves, and connective tissue.