We’ve seen how to defrost fish in the refrigerator, but alternatively, you can use cold water to help your fish thaw.
Method 2: In cold water
If you’re short on time or forgot to take your fish out of the freezer the night before, you can use cold water to reduce the time needed to thaw the fish.
First, make sure the fish is sealed in a plastic bag. The water shouldn’t touch the fish so it’s important to be careful at this stage. Place the bag with the fish in a pot filled with cold water (if the fish floats, you can use weight such as a plate to make sure it’s submerged). Let it sit for about an hour before checking if the fish is completely thawed.
For thin fish fillets, you can run the bag under a steady stream of tap water. This should be quicker but only works if your fish is thin enough.