Maybe these rabbonim think there’s something fishy about sushi. 🙂
Actually I do like sushi a lot. I usually make a “mezonos” on the rice and a “shehakol” on the fish. Although I think the better thing to do would be to say mezonos on a cracker and a shehakol on a piece of herring or gefilte fish, intending for those brochos to apply to the sushi as well.