6 ways to preserve fish

In this brief guide, we are going to answer the question “6 ways to preserve fish” and discuss 6 ways to preserve fish along with the benefits and implications of each method.

6 ways to preserve fish

6 common ways to preserve fish are:

  1. Freezing
  2. Vacuum packing and freezing
  3. Smoking
  4. Canning
  5. Brining
  6. Drying

Preserving fish by freezing

Freezing is the most commonly used method to preserve fish. Frozen fish has the best quality and tastes closest to freshly caught fish.

Fish must always be cleaned and gutted before freezing. Bigger fish are also portioned into a size needed for cooking later one while smaller fish can be frozen whole.

For bulk storage, fish can be placed in a clean container which is topped off with water. The whole container can then be frozen.

It is important to maintain the freezing temperature between  – 18 °C to – 22 °C at all times.

The shelf-life of frozen fish depends on the variety of fish. For example fish with a high-fat content such as tuna and salmon have the lowest frozen shelf-life of about 3 months while lean fish would last for about 6 months.

Vacuum packing the fish before freezing will significantly increase its shelf-life. We will discuss vacuum packing next.

Preserving fish by vacuum packing and freezing

Vacuum packing and then freezing is one of the best methods to preserve fish. This method preserves fish in its original quality and flavor for about 2 years. The only disadvantage of vacuum packaging is that it requires special equipment.

Vacuum packing works by removing the air around the fish and then sealing it in a vacuum. Once the air is removed there will be a depletion of oxygen for the aerobic microbes that cause spoilage. Reduced oxygen content also lowers the risk of spoilage due to oxidation.

Vacuum packing can be done on any variety of fish. Some fish varieties that preserve well by vacuum packing include salmon, swordfish, halibut, tuna and trout. 

Once again, it is important to maintain the freezing temperature between  – 18 °C to – 22 °C at all times.

Preserving fish by smoking

Smoking is an efficient and flavourful method of preserving fish. During smoking, fish is directly cooked from the smoke of wood. The wood smoke along with low temperature, and long cooking time imparts a distinct flavor to the fish.

Smoking works by creating an acidic coating on the surface of the fish, which kills bacteria thereby slowing down decomposition and spoilage. Smoking is more effective when the fish has been soaked in brine. Smoking and then vacuum packing preserves fish for about 3 weeks. Smoked, vacuum-packed fish can be frozen for about 3 months.

Fish is sometimes cured with salt before smoking. This prolongs the shelf-life of smoked fish.

Preserving fish by canning

Canning is a time consuming and technical yet effective way of preserving fish for long term use. Commercially canned fish has a shelf-life of 2 to 5 years, but home-canned fish must be consumed within 1 year.

Canning fish must always be done using a pressure canner. Salmon, mackerel, trout and tuna are some varieties of fish that are usually canned.

A guide to canning fish at home can be found here.

Preserving fish by brining

Brining is done by immersing fish in a salt solution. The salt will draw out the moisture from the fish, thereby preventing the growth of microbes. Salt will also directly destroy some microbes. Brined fish can be safely stored in the refrigerator for about 3 weeks.

A disadvantage of brining is the high salt content used which has been associated with hypertension.

There are several different recipes for brining fish. A recipe for brining fish can be found here.

Preserving fish by drying

Drying is a traditional method that has been used to preserve fish for ages. Fish is usually salted before drying. Fish can be either air-dried, sun-dried or even dried with a dehydrator. Drying removes the moisture from fish which in turn prevents the growth of microbes. Fish with a low-fat content such as cod, sardine, pollock, mackerel and tuna preserve longer with drying.

After drying, the fish must be stored in an airtight container or a vacuum-sealed bag to prolong the preservation time.

Dried fish will preserve well for years. Disadvantages of drying fish include the high salt content may make it unsuitable for people with hypertension and the permanent change in texture and flavor of fish.

A detailed method for drying fish can be found here.

Other FAQs about Fish that you may be interested in.

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Conclusion

In this brief guide, we answered the question “6 ways to preserve fish”. We discussed 6 methods of fish preservation and looked at the benefits and implications of each method.

If you have any questions or comments, please let us know.

References

Preserving fish safely | UMN Extension

Hi, I am Charlotte, I love cooking and in my previous life, I was a chef. I bring some of my experience to the recipes on this hub and answer your food questions.