^ Well, as the article said, other fish from inside China were used and are now basically endangered as well, so if i were to guess, the most traditional form of the medicine probably used the liver of that particular fish, and then over the years, the fish from Mexico was added to the list of useable fish livers...
Now whether that happned was 50 years ago, or 1000 years ago i don't know, but sadly its happening and still is...
Now whether that happned was 50 years ago, or 1000 years ago i don't know, but sadly its happening and still is...