4th millennium BC. The 4th millennium BC spans the years 4000 through 3000 BC. Some of the major changes in human culture during this time included the beginning of the Bronze Age and the invention of writing, which played a major role in starting recorded history.
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Try looking it up in Wikipedia. Plaice, Pleuronectes platessa, is a European fish that is related to an American fish of the same family, which they've overfished. Many nations have different names for the same fish, though some are only related species. live in the northeast US and I had never heard of plaice before this question. If I get fish and chips at all, it's probably in the summer when visiting Cape Cod, and one of the fish types listed here is used, like cod or haddock.