The Disko Fan is actually in the Baffin Bay area. That's an example of protection that looks at both the narwhal and their food source, and coral in the area as well. It's a multifaceted protection.
There's another one in the Davis Strait that does the same, for coral and sponge. Hatton Basin, which straddles the Newfoundland area and the eastern Arctic, has a similar benefit for coral and sponges.
Again, the focus is based on the best available science, restricting fishing activity that has a direct impact on that ecosystem feature.