Let's just say that there's a substantial body of literature (both popular as well as quasi-scientific, see attached) on the effects of gempylids on the human gastrointestinal system. Despite this, some foodies persist on coming up with not-quite-descriptive names for these things ("ice-cream tuna" anyone?), and they continue to be widely marketed in the US and elsewhere. This will definitely make it into an ichthyology lecture sometime...
More fun reading on the subject:
http://www.twistyfas...crap-shoot.html
(worth it just for the quote "remember to question fish authority," and...
http://www.twistyfas...on-escolar.html
cheers,
Dave