I have sushi at least once a week. I always order some type of sushi roll. Sushi does not mean "fish" in Japanese but rather signifies any vinegared rice dish. The fish is sashimi. Wrap the two together in portions and sell it as sushi, and the name still refers to the rice, not the fish.
Nigiri sushi - pieces of fish, shellfish, or fish roe over vinegared rice balls.
Sashimi - raw fish served chilled, sliced, and arranged without rice.
Maki sushi - vinegared rice with insertions, rolled up in Japanese seaweed.
