White flesh
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Rainbow trout (Nijimasu)
【Nigiri sushi: Shiromi】
Wild rainbow trout are found only in limited areas like rivers in Hokkaido and rarely appear in the general market. They possess the moderate fat and sweet flesh characteristic of freshwater fish, making them delicious as sushi toppings. However, I've never heard of a sushi restaurant in Tokyo serving wild rainbow trout. And it's also true that many sushi restaurants avoid using rainbow trout raised in sea or land-based farms.