Some truth, but not the whole story;
https://en.wikipedia.org/wiki/Flake_(fish)
Quote:
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.
|
[EDIT] Doh, too slow :(