Is a narwhale a fish

Narwhals would get along with whatever fish might not count as one of their predators or as one of their prey. They tend to follow a specialized diet. The fish that they're known to prey on include Arctic and polar cod, Gonatus squid, Greenland halibut, and shrimp. But they also are known to prey on capelin and wolffish. So the preceding fishes have the appeal of a meal, not of companionship.