(Nature's Olestra! Fish tastes buttery and delicious... but the 'buttery' comes from indigestible wax esters so eating more than a small portion/~200g/6oz gives you explosive oily shits as though you just drunk castor oil.)
Not completely fitting, but I'll leave it here anyway.
Things Involving Shipgirls That Are No Longer Allowed, Rule 1971: Just because sushi tends to equate "consumable raw fish dish" doesn't mean that you can just chow down on fish caught in the wild during escort without consulting whether the species is safe to eat first just because you wanted a "snack"!
Now you know why escolar is banned in both Italy and Japan. Considering you ate that, what's about to happen to you girls will be punishment enough. Now go grab some extra toilet paper. You will need it.