Common sushi fish

TUNA

This popular ocean-dwelling fish is often served raw in rolls or as nigiri.

This clue is a straightforward definition where "common sushi fish" directly points to tuna, a popular ingredient in sushi rolls like tekka maki or spicy tuna. No wordplay is involved—it’s simply naming a fish frequently used in Japanese cuisine. If you’ve ever ordered sushi, you’ve likely seen tuna listed as maguro (its Japanese name) on the menu. The answer fits because it’s one of the most widely recognized sushi fish worldwide.