Question: how long does it take to cook a frozen fish?
Answer: Preheat oven to 450°F.
Remove frozen fish from all packaging and rinse under cold running water to remove any ice crystals.
Arrange fish in a single layer on a baking sheet. ... 
Bake for 4-5 minutes. ... 
Continue to bake until hot and flaky in the center, about 8-12 more minutes.