Kamasu

Kamasu
Kamasu is a very fast predatory fish that can swim upwards of sixty miles per hour and can reach up to five feet in length, although specimens used for sushi are much smaller and usually only weigh less than a pound. The best kamasu comes from Kanagawa prefecture just south of Tokyo. 

It is usually served with some of its skin still on, lightly seared “aburi” style, and with some minced ginger accompaniment. A tasty, mild-flavored fish that is deservingly popular.