Some truth, but not the whole story;
https://en.wikipedia.org/wiki/Flake_(fish)
Quote:
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During the late 1960s it became apparent that larger individuals of several shark species were contaminated with high levels of heavy metals, particularly mercury, and a public outcry eventually led to a ban on the sale of large school sharks in 1972, which remained in effect until 1985.
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[EDIT] Doh, too slow :(