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Published:
March 17, 2026
Reading time:
3 minutes
Year-Round
Fresh (unprocessed) salmon fillets may be purchased year-round even without kosher certification. Some maintain that the skin must be left on so that one can verify the presence of scales, thereby confirming that it is a kosher fish. Others hold that this is not necessary, since the distinctive color of salmon itself serves as a reliable identifying siman of a kosher fish.
If salmon is purchased from an uncertified source that also processes non-kosher fish, and there is a possibility that it was cut with the same knife or on the same cutting board, one should rinse the salmon thoroughly at home and gently rub it under running water to remove any possible residue of non-kosher fish.
If the salmon is processed in any way— such as smoked (lox), seasoned, or precooked—a reliable hechsher is required due to potential additives and equipment concerns.
Pesach
May one buy fresh salmon anywhere?
The short answer is, yes.
In recent years, though, it has come to light that some fish may be dipped in a solution containing a corn-based additive prior to freezing. Since corn is kitniyos, this raises the question of whether salmon without a special Kosher for Pesach (KFP) designation should be avoided due to this concern.
Based on our research, we can recommend the following:
Me’ikar hadin, this is not a concern, and one may purchase raw, unprocessed salmon for Pesach even without a hechsher. This cornstarch treatment appears to be uncommon in the first place, and even if present, the amount of kitniyos in such a solution would be botul. Certainly, if the fish is rinsed and gently rubbed under running water at home before use, there is ample basis to permit it.
Nevertheless, one who wishes to be machmir and avoid this type of fish has room for such stringency. If so, take note of the following factors to help guide your decision:
- This concern appears to affect primarily wild-caught salmon. In farmed salmon, it seems to be extremely rare, if it occurs at all.
- The concern is more relevant with frozen fish, or fish sold as “fresh frozen” (meaning it was frozen and then thawed before sale).
- Salmon that was shipped fresh on ice from the fishery and was never previously frozen—especially if it is farmed—poses no concern. In such cases, one may follow the same guidelines that apply year-round.
Color Added
Many stores sell salmon labeled as “color added.” Does this raise a kashrus or Pesach concern?
The answer is no.
“Color added” means that the farmed salmon were fed astaxanthin, a natural or synthetic pigment, which gives the flesh its familiar pink-orange color. Wild salmon are naturally pink, but farmed salmon would otherwise appear gray. Therefore, this supplement is added to the fish’s diet to produce the color consumers expect.
Since this pigment is fed to the fish while it is alive, it does not create any kashrus concern. The label “color added” does not mean that artificial coloring was added to the salmon after it was caught or during processing.
Accordingly, salmon labeled “color added” may be purchased year-round and for Pesach as well, subject to the conditions outlined above.
It should be noted that although the color of the salmon is enhanced in this way, this does not invalidate the color as a siman kashrus, since only salmon is known to become affected with this coloring because of eating astaxanthin.
Conclusion
Fresh, farmed salmon that was never frozen does not require special KFP certification. Frozen, “fresh-frozen,” or wild-caught salmon also does not strictly require KFP certification, though a ba’al nefesh might choose to be machmir. “Color added” is never a concern.
