Some of the shark’s internal organs seem to be poisonous, the spleen? Courage? liver? Can't remember clearly.
The meat is not poisonous (it should not be poisonous, poisonous things are generally delicious), but it is extremely unpalatable (I have read about it in books before, but I have never eaten it, and I have never seen a shark with my own eyes).
You can eat shark fins, that is, shark fins, but remember: no buying and selling, no killing.
So there is no need to worry about being poisoned and dying after being bitten by a shark. But the scars left behind will probably accompany us until we grow old.