There is nothing worse than opening a package of fresh fish, expecting that clean, mild ocean aroma, and instead getting hit with a noticeably “fishy” smell.
If you’ve ever experienced that, you may have wondered whether the fish was still fresh or whether you simply needed to do something before cooking it.
One old kitchen trick has been passed down for generations:
Soak the fish in milk.
The idea sounds strange at first.
Why would putting fish into dairy make it smell less like fish?
And does it actually work?
I decided to find out.
I took fresh fish fillets and submerged them in a bowl of cold whole milk. I wasn’t trying to create a marinade or add a creamy flavor. The goal was simple: reduce that strong fishy aroma before cooking.
I left the fillets in the milk for 30 minutes.
When I removed them, something was immediately noticeable.
The fish smelled considerably milder.
But the interesting part wasn’t just the smell.
The milk had also changed the surface of the fillets, and there was a scientific explanation behind what was happening.
Here’s what I learned.
Why Does Fish Sometimes Smell “Fishy”?
Fresh fish doesn’t necessarily have a strong fishy smell.
In fact, very fresh fish should generally have a mild, clean smell.
The characteristic fishy odor that develops as fish ages is associated with chemical compounds produced as components in the fish break down.
One of the most important compounds involved is trimethylamine (TMA).
Marine fish naturally contain compounds that can eventually be converted into trimethylamine.
As fish deteriorates, microorganisms and enzymes contribute to the breakdown of these compounds, producing the familiar fishy odor.
That’s why smell can be one of the clues that something has changed.
However, there’s an important distinction:
A strong smell isn’t something that should simply be covered up with milk, lemon juice, spices, or another ingredient.
If the fish smells rotten, sour, ammonia-like, or otherwise unpleasant, don’t try to rescue it.
The safest choice is to discard questionable fish.
Milk can potentially reduce an ordinary fishy odor in otherwise acceptable fish, but it isn’t a method for making spoiled fish safe.
What Happened During the 30-Minute Milk Soak?
The first thing I noticed after removing the fillets was that the surface looked slightly different.
The fish had been sitting in cold whole milk, and the milk had coated the exterior.
There was also a noticeable difference in aroma.
The strong fishy smell was reduced.
This is where the popular milk-soaking trick gets interesting.
Milk contains proteins, including casein.
Some explanations suggest that casein can interact with trimethylamine, helping reduce the perception of fishy odor.
In simple terms, the milk isn’t magically “cleaning” the fish.
Instead, components in the milk can interact with some of the compounds responsible for the odor.
That’s why the technique can make a noticeable difference without requiring a complicated marinade.
The Milk Didn’t Make the Fish Taste Like Milk
This was another pleasant surprise.
After only 30 minutes, I wasn’t left with fish that tasted like a glass of milk.
The milk primarily affected the surface.
Once the fish was removed, I drained it and prepared it for cooking.
The finished fish still tasted like fish.
It simply had a cleaner, milder aroma.
That’s an important distinction.
The goal isn’t to eliminate the natural flavor of the fish.
Fish should still taste like fish.
The goal is to reduce an unpleasant or overly strong odor that some people find off-putting.
Why Whole Milk?
Whole milk works well for this traditional technique because it contains both water and milk proteins, along with some fat.
You don’t necessarily need a particular brand of milk.
The important part is that you’re using actual milk rather than assuming another dairy product will behave identically.
Whole milk is convenient because it’s mild, readily available, and easy to use.
You don’t need to heat it.
In fact, because you’re dealing with raw fish, keeping the milk and fish cold is important.
Why Did I Use Cold Milk?
This is one of the most important parts of the experiment.
The fish should remain refrigerated while soaking.
Don’t leave raw fish sitting in milk on the kitchen counter for 30 minutes—or longer—just because you’re following an old recipe.
The milk doesn’t make raw fish shelf-stable.
The fish remains perishable.
The FDA recommends keeping seafood properly refrigerated and following safe handling practices when preparing it.
So the bowl of milk should go into the refrigerator while the fish soaks.
The goal is:
Cold fish + cold milk + short soaking time.
Not:
Fish + milk + room-temperature kitchen counter.
Thirty Minutes Was Enough
I had originally wondered whether the fish needed to sit in milk for several hours.
It didn’t.
After 30 minutes, the difference in aroma was already noticeable.
That’s one reason I like this method.
It doesn’t require much planning.
If you’re preparing fish for dinner and notice that the smell is stronger than you’d prefer, you can place the fillets in cold milk while you prepare the rest of the meal.
By the time your vegetables are chopped and your oven is preheated, the fish may already be ready.
Does Milk Actually “Remove” the Fishy Smell?
Technically, it’s better to say that milk can reduce the fishy odor rather than claiming it completely removes every odor-causing compound.
That’s an important distinction.
A 30-minute soak isn’t going to transform an older fish fillet into something that smells like it was caught five minutes ago.
And it shouldn’t be used for that purpose.
Milk may help with the odor associated with otherwise acceptable fish, but it isn’t a freshness test or preservation method.
If your fish smells seriously wrong before soaking, don’t try to hide the smell.
The Type of Fish Matters
Not all fish have the same flavor or aroma.
Some white fish have a very mild flavor.
Others naturally have stronger aromas.
Fatty fish can also have more pronounced flavors than delicate white fish.
That’s why the milk technique may seem dramatically effective with one fish but only mildly noticeable with another.
For delicate white fish, you may notice that the finished fillet smells especially clean.
For stronger-flavored fish, milk may reduce some of the odor without eliminating its characteristic taste.
And that’s perfectly fine.
The goal isn’t to make every species of fish taste identical.
What Should You Do After Soaking?
Once the fish has finished soaking, remove it from the milk.
Don’t reuse the milk.
It has been in contact with raw fish, so it should be discarded.
Next, gently pat the fillets dry with clean paper towels.
This is an important step before cooking.
A dry surface generally browns better than a wet one.
If you’re pan-searing fish, excess moisture can cause the fish to steam rather than develop a nicely browned exterior.
If you’re baking it, patting it dry also helps prevent an unnecessarily wet surface.
Don’t Rinse the Fish Under the Faucet
You might be tempted to rinse the milk off.
There’s usually no need.
And there’s an important reason not to make a habit of washing raw seafood under running water.
Splashing can spread microorganisms around your sink and nearby surfaces.
Instead, simply remove the fish from the milk and pat it dry.
The milk doesn’t need to be completely removed by rinsing.
You’re going to cook the fish anyway.
What About the Fishy Smell in the Milk?
After 30 minutes, don’t be surprised if the milk smells unpleasant.
That’s actually one of the reasons you should discard it.
The milk has been in direct contact with the raw fish and may contain odor compounds and microorganisms from the fish.
Do not taste it.
Do not save it for another recipe.
Do not turn it into a sauce.
Just throw it away.
If you want a creamy sauce for your cooked fish, start with fresh milk and clean ingredients.
Could You Add Seasonings to the Milk?
You could, but you don’t necessarily need to.
The classic milk soak is intentionally simple.
If your goal is specifically to reduce fishy odor, plain cold milk is enough to test the technique.
Adding garlic, herbs, spices, salt, or other ingredients turns the process into more of a marinade.
That’s not necessarily bad, but it makes it harder to determine what actually changed the fish.
For my experiment, I wanted to see what the milk itself would do.
And 30 minutes was enough to notice a difference.
What Happens to the Texture?
The texture change was subtle.
The fish didn’t become dramatically softer or fall apart.
That’s another important point.
Milk shouldn’t be treated as a powerful tenderizing marinade.
A 30-minute soak is primarily about the surface and aroma.
The fish should still maintain its normal structure.
If you soak delicate fillets for an excessively long period, you may eventually affect their texture, particularly depending on the fish and other ingredients involved.
There’s rarely a need to soak fish in milk all day.
Can You Use This Trick With Frozen Fish?
You can use milk with thawed fish, but the fish should be properly thawed first.
The easiest approach is to thaw the fish under refrigerated conditions.
Once thawed, place the fish in cold milk and return the container to the refrigerator during the soak.
Don’t use the milk soak as a substitute for safe thawing.
And don’t leave frozen or partially thawed fish sitting on the counter for hours while waiting for it to soften.
Food safety comes first.
What If the Fish Still Smells Fishy After the Milk Soak?
This is where you need to use common sense.
If the fish still has a noticeable but normal seafood aroma, seasoning and cooking may be all that’s necessary.
But if the smell is:
- Sour
- Rotten
- Strongly ammonia-like
- Unpleasant in a way that makes you question the fish
- Accompanied by sliminess or other obvious deterioration
don’t keep trying different tricks.
Throw it away.
Milk isn’t a magic reset button.
No marinade can turn spoiled fish into fresh fish.
How to Tell If Your Fish Was Fresh to Begin With
Before reaching for the milk, inspect the fish.
Fresh fish should generally have a mild, fresh odor rather than a powerful unpleasant smell.
The flesh should look appropriate for the particular species and shouldn’t show obvious signs of decomposition.
If you’re buying whole fish, clear eyes and healthy-looking gills can provide additional clues, although packaging and species can affect appearance.
For packaged fillets, check the use-by or sell-by information and keep the fish refrigerated according to the package instructions.
When buying seafood, purchasing from a reputable source and keeping it cold from store to refrigerator is just as important as what you do before cooking.
Does Lemon Work Better Than Milk?
Lemon and milk serve different purposes.
Lemon juice is acidic and changes the surface of fish.
Milk is often used specifically because its proteins can interact with odor-related compounds.
If you want to reduce a fishy aroma, milk is worth trying.
If you want a bright, acidic flavor, lemon is a different tool.
You can also use lemon after cooking.
In fact, a squeeze of fresh lemon over cooked fish is one of the easiest ways to add brightness without dramatically changing the fish’s natural flavor.
What I Would Do Next Time
After seeing the result, I would absolutely use the technique again for fish that has a stronger-than-preferred but otherwise normal seafood smell.
My process would be simple:
- Keep the fish refrigerated.
- Pour cold whole milk into a clean container.
- Place the fish into the milk.
- Refrigerate for about 30 minutes.
- Remove the fish.
- Discard the milk.
- Pat the fish thoroughly dry.
- Season it.
- Cook it to a safe internal temperature.
For most seafood, the FDA recommends an internal temperature of 145°F (63°C).
That gives you the best combination of traditional technique and modern food-safety practice.
Frequently Asked Questions
Does soaking fish in milk really remove the fishy smell?
It can reduce the perception of fishy odor in otherwise acceptable fish. Milk proteins, particularly casein, are thought to interact with compounds associated with fishy aromas.
How long should fish soak in milk?
A short soak of around 20–30 minutes is a common approach. There’s generally no need to leave delicate fish submerged for many hours.
Should the milk be cold?
Yes. Keep both the milk and fish refrigerated during the soaking process.
Can I use skim milk?
You can, although whole milk is a traditional and convenient choice. The key reason for the technique is the milk’s protein content rather than simply its fat.
Should I rinse fish after soaking it in milk?
No. Simply remove it from the milk and pat it dry with clean paper towels.
Can I reuse the milk?
No. Once it has contacted raw fish, discard it.
Can milk make spoiled fish safe?
Absolutely not. If fish smells rotten or otherwise appears spoiled, discard it. Milk can reduce an odor; it cannot reverse spoilage.
Does milk make fish more tender?
It may have some effect on the surface texture, but the main reason people use this technique is to reduce fishy odor. Don’t expect a dramatic tenderizing effect from a 30-minute milk soak.
What temperature should fish reach when cooked?
The FDA recommends cooking seafood to an internal temperature of 145°F (63°C).
The Final Result
Thirty minutes in cold whole milk didn’t turn the fish into something completely different.
And that was actually the point.
The fillets still tasted like fish.
They still had their natural texture.
But the stronger fishy aroma had noticeably softened.
The experiment demonstrated why this old kitchen trick has remained popular.
Milk isn’t a miracle ingredient, and it shouldn’t be used to disguise spoiled seafood.
But when you’re dealing with fresh, properly refrigerated fish that simply has a stronger odor than you prefer, a short cold milk soak can be a simple technique worth trying.
The most important thing is to keep the process safe.
Keep the fish cold.
Use clean equipment.
Discard the used milk.
Don’t rinse raw fish around the kitchen sink.
And cook the fish thoroughly to the recommended internal temperature.
Most importantly, trust your instincts.
If the fish smells rotten or seriously unpleasant before you soak it, don’t reach for the milk.
Reach for the trash can.
But if it’s fresh fish with a normal seafood aroma that’s simply stronger than you like, 30 minutes in cold whole milk may be all it takes to make the finished dish smell noticeably cleaner and more appealing.
Sometimes the simplest old-fashioned kitchen tricks really do have a little science behind them.