Question: What kind of fish is in filet o fish?
Disambiguated questions and answers: question: What kind of fish is in filet o fish in the UK , New Zealand?
What kind of fish is in filet o fish in the US?
answer: hoki
Alaska pollock
walleye pollock
Alaskan pollock
Alaskan cod
Natural Questions answer: Alaska pollock (from the Wikipedia article "Filet-O-Fish")