Mcdonalds Filet-O-Fish Deal 2025. Since 2013, mcdonald’s has switched from cod to sustainably sourced alaska pollock, a move that supports marine conservation but slightly shifts the sandwich's familiar taste. Customers that buy one crispy fish sandwich can get a.

Since 2013, mcdonald’s has switched from cod to sustainably sourced alaska pollock, a move that supports marine conservation but slightly shifts the sandwich’s familiar taste. Waters, namely the eastern bering sea and aleutian islands, right off the coast of alaska.