Rui-be
Encyclopedia
Rui-be is a frozen salmon
Salmon
Salmon is the common name for several species of fish in the family Salmonidae. Several other fish in the same family are called trout; the difference is often said to be that salmon migrate and trout are resident, but this distinction does not strictly hold true...

 that's thawed and possibly pickled traditional in Ainu cuisine
Ainu cuisine
Ainu cuisine is the cuisine of the ethnic Ainu in Japan. The cuisine differs markedly from that of the Wajin, or ethnic Japanese. Ainu cuisine, for instance, does not prepare raw meats like sashimi instead preferring to boil, roast or cure meat...

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