Facts You Probably Didn't Know About McDonald's Filet-O-Fish
The Filet-O-Fish has always used a patty of real fish — that's why it's so delicious. Some say the original patty was made from halibut, while others claim it was New Zealand hoki.
Today, McDonald's exclusively uses Alaskan pollock. In 2013, it was declared blue label certified, a sustainability marker granted by the Marine Stewardship Council (MSC).
Both hoki and halibut are considered "red-list" fish, meaning their commercial harvest is dangerous for the longevity of both the species and the environment in which they live.
Pollock also makes the red list, but wild Alaskan pollock, which McDonald's uses, is a notable exception, certified by the MSC and Responsible Fisheries Management (RFM) programs.