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How to Thaw Fish: What You Need to Know

TL;DR: Correctly thawing fish maintains peak flavor, texture, and freshness. Avoid thawing at room temperature, in hot water, or using a microwave. The best method of thawing is in the refrigerator overnight.

Main Points:

  • Avoid thawing at room temperature: Bacteria multiply quickly and texture suffers.
  • Avoid submerging fish in water: Submerging fish in water without a bag can affect its texture.
  • Avoid hot water thawing: Rapid temperature changes cause waterlogged fish.
  • Avoid microwave thawing: Uneven defrosting and potential cooking.
  • Best practice: Thaw in the refrigerator overnight.
  • Safest quick thaw: Use cold water for 10 minutes.
  • Inspect thawed fish: Check smell, texture, and appearance before cooking.

What’s the difference between the best fish dinner you’ve ever had and the soggiest, most flavorless filet you’ve ever suffered through? Odds are good that one was thawed correctly, and the other was hastily defrosted in the sink moments before cooking.

It’s easy for home chefs to send the delectable flavor of their seafood down the drain—often literally! Even the highest-quality frozen seafood will flop if you don’t take the time to thaw it the right way. Sometimes, thawing fish the wrong way can even make it unsafe to eat. 

If you want to cook your favorite fish dinner right, you need to learn to thaw fish like a professional. Continue reading to learn how to preserve the ocean-fresh flavor and texture you crave! 

fresh thawed fish fillet on a glass plate

How NOT to Thaw Fish: What to Avoid

First, let’s review the most common mistakes that home cooks tend to make when preparing frozen fish

Don’t Thaw Fish at Room Temperature

It may seem logical to set your frozen fish on the counter to thaw while you go about your day. The longer you leave seafood at room temperature, the faster bacteria will multiply on the surface of your food. Bacteria tend to flourish at temperatures above 40 degrees Fahrenheit. Assuming you don’t live in an igloo, your kitchen is likely too warm, and it isn’t worth the risk.

Likewise, moving your delicate filet from the freezer to the counter is a major temperature change. Even if you avoid bacteria, leaving fish out can cause unpleasant changes in the texture of your seafood. As a result, you’ll miss out on the light and flaky fish dinner you had in mind. Nobody likes waterlogged salmon!

Don’t Thaw Fish in Hot Water Right Before Cooking

You forgot you’d committed to cooking fish tonight, and the lovely salmon steak you brought home is still frozen solid. With an hour or two until dinner, it seems logical to defrost it under hot water in the sink. 

Unfortunately, any rapid shift in temperature has the potential to destroy the fish’s texture. A sudden change from the chilly depths of the freezer to a boiling sink bath will leave you with a half-poached mess

Not only will your delicious seafood end up waterlogged and lose its natural flavor, but the hot water has a high probability of breeding bacteria. The speed of this ill-advised defrosting method is simply not worth the risk.

Don’t Microwave Frozen Fish

You want to thaw your fish quickly, and your microwave has a convenient “defrost” setting. Is it safe to use it to thaw fish fast?

If you’ve ever accidentally exploded something in the microwave, you know it’s not a very consistent tool. It may defrost your fish, but it will defrost it unevenly. The result? More texture issues.

It’s also common for the thinner parts of your seafood to begin to cook on the defrost setting. The result will be a nightmare of uneven textures and doneness. The flavor will likely suffer, too.

Diners toast over a seafood dinner

How to Thaw Frozen Fish: Best Practices

Unfortunately for last-minute chefs, the best way to thaw frozen fish requires several hours of forethought. Experts recommend defrosting your fish in the refrigerator overnight. By defrosting fish below room temperature, you’re preventing bacteria growth. Plus, a slow thaw preserves the fish’s texture and natural moisture level, ensuring it remains flaky and flavorful. 

Ideally, you should remove the frozen fish from its original packaging and place it in a kitchen-safe plastic bag or plastic wrap. Place this in a container or bowl to catch any drips and to avoid cross contamination before placing it in your refrigerator for a minimum of 8 hours, or until fully defrosted. Very thick portions might need more time to thaw completely. 

You can leave defrosted fish in the refrigerator for up to two days after thawing it. Even so, it’s best to cook your fish fairly quickly after it's fully defrosted. 

How to Thaw Out Fish Quickly

Hindsight is 20/20 and doesn’t help you much when you have company on the way. If you need to thaw fish fast, consider using cold water. Place your fish in a sealable bag and submerge it in cold water for approximately 10 minutes. You may need to need to double bag it to avoid any leakage and replace the water periodically as it approaches room temperature. 

Check Your Thawed Fish Before You Cook It

Even if you thaw fish the right way, we recommend a quick sensory inspection before you begin cooking. 

  • Smell: While your fish might smell like the ocean, ensure it doesn’t smell especially “fishy.” Likewise, if your fish smells chemical or like ammonia, it is probably spoiled. If the scent is enough to give you pause, something is probably wrong. Discard pungent fish and do not serve or consume it. 
  • Touch: Your fish should be firm, moist, and hold its shape. It should spring back if you press on it lightly and it should not be slimy. Fish that is dry, very soft, or disintegrating may be unsafe to consume. 
  • Sight: Always inspect your seafood for any signs of discoloration, or more uncommonly, mold. These are a sure sign that your fish is unfit for consumption.

If you thaw your fish correctly, frozen fish can be fresher and safer than “fresh fish.” Frozen seafood has significantly improved with advancements in freezing technology over the last couple of decades. For example, North Coast Seafoods’ frozen fish is flash-frozen within hours or even minutes of harvest, locking in peak freshness, texture, and flavor. The proper defrosting method ensures your favorite frozen filet will taste dock-fresh and delicious every single time! 

Are you ready to give these professional thawing methods a shot? North Coast Seafoods has the delectable frozen fish you crave! Visit our site to order sustainable seafood like shrimp, salmon, crab, & more, right online!

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