A case of tuna loins sat on a loading dock for five hours in July. Which statement about the histamine that may have formed is correct?
a.Freezing the tuna solid will break the histamine down
b.Searing the tuna to 145°F will break the histamine down
c.Histamine is never destroyed by cooking or freezing
d.Histamine is removed by rinsing the loins under water
Explanation
Histamine builds up when scombroid fish such as tuna, mahi-mahi, and bonito are time-temperature abused, and it is a heat-stable chemical rather than a living organism. Cooking, freezing, and rinsing all leave it intact, so the only controls are buying from a reputable supplier and keeping the fish cold from the moment it arrives.
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