Yes, sushi is in the zone but the exact block count for the piece you are talking about is beyond me.
I stopped in at my favorite sushi restaurant for lunch yesterday and had a sushi, shashimi bento box lunch. Miso soup starter with 2 small pieces of salmon maki, 1 large slice california roll, 2 pieces sushi--one tuna, one salmon, thinly sliced salmon, an equally thinly sliced white fish and a claw of some sort sashimi or a bed of shredded daikon, fresh mixed green salad with some sort of dressing that looked and tasted French. It was served with a bowl of rice which I did not touch. Oh yes, green tea.
In addition there were 2 prawns, 2 thinly sliced carrots and a small piece of squash tempura.
So there was approximately 3 ounces of fish, about 1/2 C rice but probably less, and the fat in the deep fry, the avocado piece in the california roll, and salad dressing. I think if I skipped the rice on the one piece of sushi it would have been a balanced zone meal. Perhaps high on the fats?
I have a very thick book of foods with their nutrient value and they do not mention sushi.
In order to determine zonefulness you have to eyeball the portions of each P-C-F and decide for yourself. Also how did you feel 3 hours later? Me? I was not hungry for at least 4 hours post lunch and my heartbeat remained stable. For me that is a balanced meal.
Hope this helps but the Tech can do better than I can.