Exploring the Freezing of Sashimi: Preserving the Delicacy of Raw Fish

Freezing Sashimi: An Investigation into the Preservation of Raw Fish

Sashimi, a Japanese culinary delicacy consisting of thinly sliced raw meat, is a popular dish enjoyed by many. However, a common question is whether sashimi can be frozen. This article aims to provide a comprehensive exploration of the freezing process for sashimi, including its safety and best practices.

Understanding Sashimi

Sashimi is often mistaken for sushi because of its association with sushi restaurants. However, there are important differences between the two. Sashimi refers to raw meat, typically fish, that is thinly sliced. Sushi, on the other hand, consists of vinegared rice and various ingredients such as raw or cooked fish, vegetables, and seaweed.
When eating sashimi, proper preparation is crucial. It is important to ensure that the raw meat has been professionally prepared or that you have the necessary skills and knowledge to handle it safely.

The Importance of Sashimi Grade Fish

There is a difference between raw fish and “sashimi grade” fish. Sashimi grade fish has undergone rigorous measures to eliminate any bacteria or organisms that may be present, making it safe for raw consumption. Reputable restaurants and specialty shops often offer sashimi-grade fish, ensuring high quality and safe consumption.
While some people believe that fresher fish is safer to eat, this idea does not take into account the presence of parasites in the fish. Freezing fish is generally considered the safest method for raw consumption, as it helps to eliminate parasites. For freshwater fish, it is recommended to follow FDA standards: freeze for a minimum of 15 hours at a temperature of -31°F or for a minimum of 7 days at a temperature of -4°F.
It is important to note that there are no absolute regulations regarding the term “sashimi grade”. Therefore, it is important to choose reputable suppliers and establishments with a long-standing reputation for maintaining high standards of fish quality. Certain shellfish and tuna that are resistant to parasites, as well as carefully farmed fish that are protected against parasites, may not require freezing before serving raw.

Freezing Freshly Caught Fish

For people who regularly catch fresh fish, freezing the fish before eating it raw is a recommended safety measure. Unless you have access to a commercial freezer, it is difficult to achieve the low temperatures necessary to safely freeze fish. Home freezers typically maintain a temperature of 0°F, which is insufficient to meet safety standards. As a result, there is a risk that parasites may not be adequately killed and the quality of the fish may be compromised.
To freeze fish for sashimi consumption at home, there are several important steps to follow:

  1. Thoroughly clean the freshly caught fish, including descaling, deboning, and removing the fins.
  2. Depending on the size of the fish, cut into large steaks or fillets for freezing.
  3. Optionally, pre-treat the fish to protect against flavor and texture changes. Fatty fish such as mackerel, trout, salmon, or tuna can be soaked in a solution of 1 quart of cold water and 2 tablespoons of crystalline ascorbic acid for 20 seconds. Lean fish such as flounder, cod, snapper, or freshwater fish can be pre-treated with a brine of 1 quart cold water and ¼ cup salt for 20 seconds.
  4. Place the fish in the freezer, unwrapped, in a single layer until frozen solid, which usually takes about 30 minutes.
  5. Optionally, apply an ice glaze to further protect the fish. Dip the steak or fillet in lightly salted water (1 tablespoon of salt per quart of water) and immediately return to the freezer. Repeat this process, allowing the glaze to set between each dip for about 5 minutes, until a uniform ¼” thick glaze forms around the meat.
  6. Finally, store the frozen steaks and tenderloins in a freezer-safe Ziploc bag, removing as much air as possible, or wrap each in plastic wrap and place in a freezer-safe, airtight container.

Freezing Sashimi Leftovers

While freezing fresh fish for sashimi consumption is recommended, the same cannot be said for sashimi leftovers. It is not advisable to freeze prepared sashimi, whether leftovers or takeout, in your home freezer for later consumption. This practice can severely compromise the quality of the fish, resulting in a mushy and undesirable texture.
Sashimi-quality fish is usually frozen once, and refreezing it can further degrade its quality, especially in a home freezer. If you find sashimi-quality fish in a supermarket or specialty store and can ensure that it stays frozen until you get it to your freezer, you can keep it frozen for later consumption as long as you follow the proper freezing guidelines mentioned above.

Bottom line

In summary, freezing sashimi-grade fish before eating it raw is generally recommended for safety reasons. Freezing helps eliminate parasites and ensures the quality and integrity of the fish. However, it is important to obtain sashimi-grade fish from reputable suppliers and establishments with a strong reputation for quality and safety. For individuals who catch fresh fish, freezing it in a commercial freezer or following proper home freezing guidelines is essential to minimize the risk of consuming unsafe raw fish.
It is important to note that while freezing fresh fish is recommended, freezing prepared sashimi leftovers at home is not recommended as it can result in a loss of quality and texture. To fully enjoy the delicate flavors and textures of sashimi, it is best to eat it fresh or freshly frozen.
Remember that proper handling, preparation, and storage practices are key to ensuring the safety and enjoyment of sashimi. By following the guidelines outlined in this article, you can safely freeze sashimi-grade fish and enjoy this exquisite delicacy with peace of mind.


Can I freeze sashimi quality fish?

Yes, freezing sashimi-grade fish is recommended for safety reasons. Freezing helps eliminate parasites and ensures the quality and integrity of the fish.

Can I freeze leftover sashimi?

It is not advisable to freeze prepared sashimi leftovers as this may result in a loss of quality and texture. It is best to eat sashimi fresh or freshly frozen.

How should I freeze freshly caught fish for sashimi?

To freeze fresh-caught fish for sashimi, clean the fish thoroughly, cut it into steaks or fillets, pre-treat it if necessary, place it in the freezer unwrapped until frozen solid, apply an ice glaze if desired, and store it in a freezer-safe container or bag.

What is the recommended freezing time and temperature for sashimi-grade fish?

For most freshwater fish, the safest way to eat raw fish is if it has been pre-frozen to FDA standards: at least 15 hours at -31°F or at least 7 days at -4°F.

What is the difference between sashimi and sushi?

Yes, sashimi refers to thinly sliced raw meat, typically fish, while sushi consists of vinegared rice and various ingredients. Sashimi is the raw meat itself, while sushi includes the rice and other components.

What is sashimi grade fish?

Sashimi grade fish is fish that has undergone rigorous measures to ensure it is safe for raw consumption. It has been treated to eliminate any bacteria or organisms that may be present, making it suitable for raw consumption.