The Japanese also have Salmon, but they didn't eat it raw because the Salmon found in Japan's waters were full of parasites that made people sick; it's not that they "didn't like it". The Norwegians, having access to parasite-free Salmon, saw this as an opportunity to expand their fish exports to the Japanese market.
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The truth is a little more complicated than this:
The Japanese also have Salmon, but they didn't eat it raw because the Salmon found in Japan's waters were full of parasites that made people sick; it's not that they "didn't like it". The Norwegians, having access to parasite-free Salmon, saw this as an opportunity to expand their fish exports to the Japanese market.