Is mackerel kosher? Yes, and the answer is settled. Atlantic mackerel, Pacific mackerel, Spanish mackerel, and king mackerel all have the fins and removable scales that Torah law requires. You can look up mackerel or any other fish on KosherFish to confirm the status before you buy.
The Fins and Scales Rule
The Torah sets a two-part test. Leviticus 11:9-12 and Deuteronomy 14:9-10 both state the same rule: a kosher fish must have fins and scales. Both, not one or the other. Shellfish have neither. Sharks and eels fail on scales. Catfish have no scales at all.
But the Torah’s word for “scales” is narrower than the biology term. Halachic scales are the kind you can lift off without tearing the skin beneath. A fish with removable scales, the ctenoid or cycloid type, qualifies. Sturgeon’s ganoid scales are embedded in the skin. Shark skin is covered in tiny placoid denticles, not true scales at all. Both fail the halachic test even though biologists call those structures “scales.”
Mackerel falls cleanly on the kosher side. Its scales are thin, overlap like roof tiles, and lift off easily. There is no halachic dispute about mackerel’s status the way there is about swordfish, where adult fish lose most visible scales. Mackerel carries its scales throughout its life.
Which Mackerel Are Kosher?
The name “mackerel” covers a wide family, and nearly all of the species you will actually encounter at a market are kosher. Here is what to know about each one.
Atlantic mackerel (Scomber scombrus) is the one most people picture: iridescent blue-green stripes, sold fresh or smoked. Kosher. The Orthodox Union and the Chicago Rabbinical Council both list it as a kosher species.
Pacific mackerel (Scomber japonicus, also called chub mackerel) is closely related to Atlantic mackerel and shares the same scale structure. Kosher. The cRc lists it alongside Atlantic mackerel.
Spanish mackerel (Scomberomorus maculatus) is a lean, mild fish popular in the Southeast. Also kosher. The cRc’s fish list includes Spanish mackerel explicitly.
King mackerel (Scomberomorus cavalla), sometimes sold as “kingfish,” runs larger and is popular smoked or as steaks. Kosher per the cRc list. Be aware that “kingfish” is also a regional nickname for yellowfin tuna, so confirm the species name on the label when you buy.
Wahoo (Acanthocybium solandri) is sold in Hawaii as “ono” and sometimes grouped with mackerel in menus. Wahoo is a separate species, but it is also kosher. The OU and cRc both list wahoo as kosher. It matters mainly if you are at a fish counter where “mackerel” and “ono” get used loosely.
Canned mackerel is different from the fresh fish when it comes to kosher certification. See the section below on hechsher requirements.
Is Mackerel Kosher? What the OU and cRc Say
Two of the most widely relied-on kosher certification authorities in North America publish kosher fish lists. Both confirm that mackerel is kosher.
The Orthodox Union (OU), one of the largest kosher certifiers in the world, lists mackerel as a kosher species. The OU’s guidance on fish relies on the same fins-and-removable-scales standard set in the Torah, and mackerel passes cleanly.
The Chicago Rabbinical Council (cRc) publishes one of the most detailed kosher fish lists in use. It lists Atlantic mackerel, Pacific mackerel, Spanish mackerel, and king mackerel individually as kosher. The cRc is the reference many kosher consumers and restaurants lean on precisely because it names individual species rather than just families.
There is no recorded halachic dispute (machloket) about mackerel among major authorities. Unlike swordfish, which has a documented debate about adult scale loss, mackerel is a settled case. If you follow the Star-K or OK Kosher, those certifiers also recognize mackerel as kosher by the same fins-and-scales reasoning.
Does Mackerel Need a Kosher Certification?
The answer depends on how the fish is sold. This is one of the more practical questions for anyone keeping kosher, and the rule is straightforward once you understand the logic behind it.
Whole fresh mackerel with skin on: No hechsher required. When you can see the skin and scales yourself, you can verify the species. This is the classic rule for fresh fish. Buy it from a reliable fishmonger, confirm you are looking at mackerel and not a substitute, and you are set.
Fresh fillets without skin: More care needed. Once the skin and scales are removed, you cannot verify the species by sight. A fillet that looks like mackerel could be a different fish entirely. The OU and cRc both advise buying skinless fillets only from a shop you trust, or looking for a hechsher on packaged fillets.
Smoked mackerel: A hechsher is strongly recommended. Smoked fish is processed, often on shared equipment. Non-kosher fish or flavorings may have been processed on the same line. Buy from a certified kosher producer when you can.
Canned mackerel: Always look for a hechsher. Canned fish is cooked in the can with water, oil, or sauce. The can’s contents and the equipment used to fill it both matter. Several widely-available canned mackerel products carry OU or Star-K certification. Check the label.
If you are unsure about a specific product, ask your rabbi or check with a reliable certifying agency. KosherFish can confirm the species status, but certifier guidance on a specific product’s production is a question for the certifier or your posek.
Mackerel at the Market: Names and Look-alikes
Mackerel’s one practical complication is naming. Several different species travel under the “mackerel” label, and an occasional non-mackerel species ends up in the mix too.
In American markets you might see “Boston mackerel” (another name for Atlantic mackerel), “blue mackerel” (sometimes Pacific, sometimes Atlantic), “jack mackerel” (actually a different fish, Trachurus symmetricus, though also kosher per the cRc), and “Sierra mackerel” (another name for Spanish mackerel). These are all kosher, but confirming the species on the label is a good habit.
The more important look-alike warning: some grocery stores and fish counters label oilier, cheaper scomberomorid species as “mackerel” when they are technically a different genus. In most cases these are still kosher fish. But if the label just says “mackerel” with no species detail on a skinless fillet, ask the fishmonger for the full species name and confirm it against the cRc list or the KosherFish tool before you buy.
| Fish | Kosher? | Why |
|---|---|---|
| Atlantic mackerel (Scomber scombrus) | ✅ Yes | Fins and cycloid scales; listed kosher by OU and cRc |
| Pacific mackerel (Scomber japonicus) | ✅ Yes | Same scale structure as Atlantic mackerel; listed kosher by cRc |
| Spanish mackerel (Scomberomorus maculatus) | ✅ Yes | Fins and removable scales; listed kosher by cRc |
| King mackerel (Scomberomorus cavalla) | ✅ Yes | Fins and removable scales; listed kosher by cRc |
| Wahoo / Ono (Acanthocybium solandri) | ✅ Yes | Fins and removable scales; listed kosher by OU and cRc |
| Shark | ❌ No | Placoid denticles, not halachically valid scales |
| Catfish | ❌ No | No scales at all |
| Canned mackerel (no hechsher) | ⚠️ Check | Processing equipment and additives require kosher certification |
Mackerel for Shabbat and the Holidays
Mackerel shows up on Shabbat and holiday tables for good reason. It is affordable, widely available, and takes well to smoking, pickling, and pan-frying. A few notes for those who keep strict kosher:
Fish is pareve. It is neither meat nor dairy, so it can be served with either in a kosher meal. But many Ashkenazi communities follow the custom of not eating fish and meat on the same plate. If you are serving mackerel at a meat meal, use a separate serving dish and utensils, and check with your rabbi or your family’s minhag if you are unsure. This is a minhag (custom), not a Torah prohibition, but it is widely observed.
Smoked mackerel is a classic Shabbat appetizer at many tables. Make sure the smoked fish carries a hechsher, as noted above. Several national brands of smoked mackerel are OU-certified. Read the label before you shop.
Check Any Fish with KosherFish
Mackerel is a clear yes. But fish labeling is loose, and markets carry hundreds of species. If you want to double-check a specific product or a fish you are not sure about, the KosherFish lookup tool covers 291 species. Type the fish name and you get an immediate answer.
You can also browse the full kosher fish list or go straight to the mackerel species page. For checking fish at a store or a restaurant, the KosherFish iOS app and the Android app give you the same lookup in your pocket.
Frequently Asked Questions
Is mackerel kosher?
Yes, mackerel is kosher. Atlantic, Pacific, Spanish, and king mackerel all have fins and the kind of removable scales that Torah law requires (Leviticus 11:9-12). The Orthodox Union and the Chicago Rabbinical Council both list mackerel as a kosher species. There is no recorded halachic dispute about mackerel’s status.
Does canned mackerel need a kosher certification?
Yes. Canned mackerel is processed with water, oil, or sauces, and the equipment used in canning may process non-kosher fish on the same line. Always look for a hechsher on canned mackerel. Several brands carry OU or Star-K certification. Read the can’s label before you buy.
Is smoked mackerel kosher?
Smoked mackerel can be kosher, but it requires a hechsher. Smoking is a form of processing, and shared equipment or non-kosher flavorings can make an otherwise kosher fish non-kosher. Look for a reliable kosher certification (OU, Star-K, OK Kosher) on any smoked mackerel product before you buy.
What makes a fish kosher or not kosher?
The Torah (Leviticus 11:9-12, Deuteronomy 14:9-10) requires two things: fins and scales. The scales must be the kind that lift off without tearing the skin, called ctenoid or cycloid scales. Sharks have embedded placoid denticles, sturgeon have ganoid scales that cannot be removed cleanly, and catfish have no scales. Those species are not kosher. Mackerel passes both tests.
Is king mackerel kosher?
Yes, king mackerel (Scomberomorus cavalla) is kosher. It has fins and removable scales and is listed as kosher by the Chicago Rabbinical Council (cRc). King mackerel is sometimes sold as “kingfish,” a nickname also used for yellowfin tuna in some regions, so confirm the species name on the label.
Is mackerel pareve?
Yes. Mackerel is pareve, meaning it is neither meat nor dairy and can be served with either in a kosher meal. However, many Ashkenazi communities follow the custom of not eating fish and meat on the same plate. This is a minhag (custom), not a Torah prohibition. Check with your rabbi or your family’s practice if you are unsure.
Do I need a hechsher for fresh mackerel?
Whole fresh mackerel with the skin and scales on does not require a hechsher. You can see and verify the species yourself. Skinless fillets are trickier because you cannot confirm the species without the identifying skin, so buy those only from a trusted fishmonger or look for a certification on the package.
The Bottom Line
Mackerel is kosher. Atlantic, Pacific, Spanish, and king mackerel all have fins and removable scales, the two requirements from Leviticus 11:9-12. Both the Orthodox Union and the Chicago Rabbinical Council confirm the status. Fresh whole mackerel needs no special certification. Canned or smoked mackerel does.
If you are shopping and want a quick check, the KosherFish lookup tool covers mackerel and 290 other species. See the full kosher fish list, or go straight to the mackerel species page for more detail. The iOS app and Android app let you check any fish at the store in seconds.
For more on the kosher rules behind the fish question, see what makes a fish kosher, the guide to the most common kosher fish, and how kosher certification works for fish.