Originally Posted by robyng

. Salmon is considered an oily (fatty fish). Also - salmon sushi in Japan used to be almost non-existent. It's apparently becoming more common now. If you want a "non-fatty" fish - there are plenty to choose from. Robyn

Originally Posted by AlwaysAisle

In Japan tuna is one of most popular items in sushi, for long time salmon was not eaten raw in Japan. I do not want to gross people out, but reason is salmon in Pacific Ocean has parasite which is not suitable for consuming raw.

As you mentioned, fatty tuna is what Japanese eat raw. Non-fatty tuna is usually eaten cooked in Japan and non-fatty tuna is considered lower grade sushi or sashimi. It is likely that many sushi restaurants do not have non-fatty tuna because of that.

If you want non-fatty tuna sushi or sashimi then you may want to do take out sushi at super market. Even takeout food court at basement of department stores do not go for low end food items, and doubt you will find non-fatty tuna sushi at department store basement food court.