The fin whale (Balaenoptera physalus), also called the finback whale, razorback, or common rorqual, is a marine mammal belonging to the suborder of baleen whales. It is the second-largest animal after the blue whale.
The photo was taken at the entrance to Katlian Bay. The whale is coming up to scoop up a mouthful of herring. The kayaker is a local Sitka Dentist. The whale's mouth is fully open with the bottom half under the boat by Mark Tennant.