Some people have a tendency to claim that humans 'always' have been eating this or that - like eg. fish and meat. They probably don't know much about cultures that has been (and is) living on a meat/fish free diet in other parts of the world for thousands of years.
Like many others, that may have been thinking of Europeans only, and assumed that we 'always' have been eating fish.
According to professor Michael Richards from the Max Planck Institute in Leipzig, there was a long period (starting ca. 4000 BC) where people from Great Britain and many other Europeans didn't eat fish at all. The period lasted for circa 4000 years, and in some areas, like the Orkney Islands, it was only when the Norwegian Vikings arrived that they started to eat fish again.
More (in Norwegian) here.
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