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Tuna is another popular seafood option and comes in a variety of species, cuts and more. Fresh tuna should be firm, almost translucent in color and have absolutely no smell. Keeping your fish stored properly until you are ready to use it is key to maintaining the integrity and flavor of the fish. Use previously frozen tuna immediately.
Wrap and store fresh in the freezer for future use. To store fresh tuna: Add one tablespoon of ascorbic acid crystals to a quart of water or use 1/4 cup of salt in a quart of water and dip the fish in the solution Seal the fish in a plastic wrap and place it into a zip-lock bag.
It is best to freeze the fish in an ice block. You can do this by placing it into the plastic bag and covering it with water. The tuna can be frozen for up to three months. When you are ready to prepare it, simply thaw out the fish in your refrigerator. Do not microwave the fish as this process can prematurely cook it.