We recently received this query, and it’s one many folks wonder about, and Vital Choice founder-president Randy Hartnell penned this response:
Dear Vital Choice,
Do smoked and canned salmon contain as much omega-3s as fresh salmon does?
Thanks,
JR
Dear JR,
The answer to your question depends on the smoking and/or cooking process used.
Generally speaking, the more moisture (water) that's removed from fish by smoking or cooking, the greater the percentage of various nutrients left behind, including omega-3s.
Cold smoking – the process used for our salmon and sablefish nova lox – removes the least amount of moisture, so it has the least impact on the omega 3 levels.
Drier smoked salmon (aka "hot smoked" or "kippered") loses more water, leaving a higher level of omega-3s per serving.
Below are omega-3 values taken from the USDA Nutrient Database (Release 22, 2009), for a variety of sockeye salmon species and preparations.
Note that omega-3 levels within a single salmon species (e.g., sockeye, king, silver) can vary dramatically depending upon the time of year and each fishes' area of origin, so the differences in omega-3 content shown here may not be fully attributable to method of preparation.
Omega-3s (EPA + DHA) per 100g serving
USDA data unless otherwise noted.
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Raw sockeye salmon – 1.16 grams* to 1.18 grams
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Sockeye salmon (cooked with dry heat) – 1.23 grams
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Canned sockeye (drained solids with bone) – 1.45 grams
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Canned smoked sockeye – 1.57 grams
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Smoked sockeye (fillets with skin) – 2.43 grams
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Smoked king salmon – 0.45 to 0.52 grams (45 to 52 mg)
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Smoked Yukon king salmon – 1.25 grams*
*Vital Choice test data
For your information, canned salmon is cooked under pressure to a maximum of 245° F (see our FAQ on this subject).
Also, be aware that freezing does not reduce the omega-3 content of salmon, so the omega-3 figures for fresh salmon apply to frozen salmon as well.
But because omega-3s will oxidize over time in the freezer, we advise people to keep our frozen fish portions and fillets in their original, airtight vaccum packs and consume them within two to three months of purchase.
I hope this answers your question ... please let us know if you have any others!
Best regards,
Randy Hartnell, President
Vital Choice Wild Seafood & Organics