What five cans of fish actually deliver, once you put price, omega-3s and mercury in the same table
Credit: Daily Vitality
The canned fish aisle is one of the few places in the supermarket where the cheapest option might also be the best one, and almost nobody sorts it that way. You reach for tuna because you have always reached for tuna. Maybe you have read that sardines are the smart choice, so a tin of those goes in the cart too, and you feel vaguely virtuous about it. The mackerel sits on the bottom shelf, in a can the size of a soup tin, costing less than almost anything around it, and you walk right past.
That habit is worth revisiting, and the reason is that three separate public datasets have never really been laid on top of one another. There is federal data on how much omega-3 each fish contains. There is separate federal data on how much mercury each fish carries. And there is the price on the shelf, which anyone can look up but which almost no nutrition article bothers to include. Each of those numbers on its own tells you very little. Together they tell you something quite specific about which can is doing the most work for you.
So we built the table. Every fish is scored on grams of EPA and DHA — the two long-chain omega-3s that come from seafood — per dollar spent, using government nutrition records. Alongside that sits the mercury each one carries, from the Food and Drug Administration's own sampling, and the sodium, because a fish that wins on omega-3s and doubles your salt has not really won anything.
The result surprised us, and it may surprise you. The fish most people would have picked as the winner comes third. The fish that actually wins is the one almost nobody buys.
Here is the whole argument in one table. The nutrition figures come from USDA FoodData Central, and the record number for each one is included so you can pull it up and check it yourself. The mercury column comes from FDA sampling, converted to the four-ounce serving the agency uses in its own guidance. Prices were taken from Walmart.com on August 31, 2026.
Prices as of August 31, 2026, from Walmart.com: Iberia jack mackerel 15 oz at $2.47; Great Value Alaskan pink salmon 14.75 oz at $3.97 in a four-pack; Great Value sardines in water 3.75 oz at $1.36 in a six-pack; Great Value solid white albacore 5 oz at $1.98; Great Value chunk light tuna 5 oz at $0.96.
The spread from top to bottom is wider than almost any comparison of this kind produces. A dollar spent on jack mackerel buys roughly six times the EPA and DHA that the same dollar buys in chunk light tuna, and mackerel manages that by winning on both halves of the equation at once — it is the densest in omega-3s and the cheapest per ounce on the shelf.
Salmon finishing second is the other quiet surprise, and the explanation has more to do with packaging than with fish. The large 14.75-ounce can is simply a more efficient format than the small tin, which is also why sardines land in third despite carrying slightly more omega-3 per gram than salmon does. If you have followed our best protein per dollar ranking, this is the same effect that pushes large-format staples up that list.
Every ranking of this kind lives or dies on its method, so here is ours in full, including the parts that are imperfect.
Each fish is represented by a single USDA FoodData Central record for the drained solids, because drained solids are what you actually eat. The EPA and DHA figures are the two fatty acids listed separately in those records, added together. Total omega-3 numbers, which some articles quote, are higher because they sweep in other fatty acids that seafood is not really prized for.
That choice of record matters more than you might expect. USDA's own data shows canned pink salmon carrying 0.718 grams of EPA per three-ounce portion when the bones and canning liquid are counted, and only 0.284 grams once it has been drained, a two-and-a-half-fold difference that has nothing to do with the fish and everything to do with what goes down the sink. Sardines behave the same way. The oil-packed drained entry reads lower than the tomato-sauce entry, because some of the omega-3 leaves with the oil you pour off.
All five cans were priced at a single retailer, on a single day, in the same national market. Walmart was chosen because its listings are public and its store brand covers most of the category, which keeps brand positioning from contaminating the comparison. Where no store-brand version exists — and Walmart carries no store-brand mackerel at all — the cheapest widely stocked national brand was used instead, and that substitution is named in the table notes rather than buried.
Cans declare net weight, which includes the packing liquid, while the nutrition figures apply to drained solids. That mismatch means the per-dollar figures here understate the true cost per gram of fish, and it applies to every row. The ranking itself holds up because the gaps between fish are large — mackerel does not beat tuna by a few percent, it beats it several times over — but treat the absolute numbers as comparative rather than precise. Our grocery store nutrition-per-dollar analysis runs into the same tension between what a label declares and what you take home.
Canned jack mackerel contains 1.230 grams of EPA and DHA per 100 grams, according to the USDA record for drained jack mackerel, which is more than sardines, more than salmon, and roughly five and a half times what you get from chunk light tuna. At the same time it was the cheapest fish per ounce of anything in this comparison, undercutting even the budget tuna that most people think of as the floor of the category.
There is no clever explanation for this. Mackerel is abundant, it is not fashionable, and it comes in a big utilitarian can with a picture of a fish on it. The price reflects demand rather than quality, which is the same reason lamb shoulder costs less than lamb rack.
It also carries 241 milligrams of calcium per 100 grams, because the soft bones are canned along with the flesh and you eat them without really noticing. Very few foods hand you that much calcium incidentally.
Jack mackerel has a strong, distinctly oily flavor that people tend to either enjoy immediately or need to work up to. It is usually sold in tomato sauce or brine rather than water, and it is closer in character to sardines than to tuna. If you have only ever eaten canned tuna, it is a real change of register rather than a swap.
Here is where the label stops helping you, and it is the most useful thing in this article.
"Mackerel" is not one fish. It is a word covering several different species whose mercury content varies enormously, and the FDA and Environmental Protection Agency's joint advice on eating fish sorts them across all three of its categories at once. Atlantic mackerel and Pacific chub mackerel appear under Best Choices. Spanish mackerel sits one tier down under Good Choices. King mackerel is in Choices to Avoid, flagged for the highest mercury levels.
The underlying numbers explain the split. FDA sampling puts Atlantic mackerel at a mean of 0.05 parts per million and Pacific chub at 0.088, while Spanish mackerel comes in at 0.182 in the South Atlantic and 0.454 in the Gulf of Mexico, and king mackerel reaches 0.73. That is a fourteen-fold range under a single word, and the Spanish mackerel figures are the detail that should give any shopper pause: the same species, differing two and a half times depending only on which body of water it was pulled from.
That last row is the honest complication in this article, and it deserves stating plainly rather than glossing. Jack mackerel — the species in virtually every American can labeled "jack mackerel," and the fish that tops our ranking — appears in neither the FDA mercury table nor the advice chart. It has no federal mercury figure of its own and no federal category. What can be said is that the mackerels FDA has sampled span 0.05 to 0.73 parts per million, that the two closest relatives commonly canned sit at the low end, and that jack mackerel is a small, short-lived, fast-growing fish of the kind that generally accumulates less mercury than large predators do. What cannot be said is that FDA has rated it, because it has not.
Canned pink salmon carries 0.955 grams of EPA and DHA per 100 grams and, at 0.014 parts per million, sits essentially at the floor of the FDA mercury range. It is one of the lowest-mercury fish the agency samples, and the large-can format makes it unexpectedly economical.
Sardines are the fish everyone names, and they earn most of their reputation. At 0.982 grams per 100 grams they carry marginally more omega-3 than salmon, and at 0.013 parts per million they are the single lowest-mercury entry in the entire comparison — roughly one twenty-seventh of what albacore tuna carries. What holds them back in this particular ranking is not the fish at all. It is the tin. A 3.75-ounce sardine can costs nearly twice as much per ounce as a 14.75-ounce salmon can, and that alone is the difference between second and third place.
Both fish share the bone advantage. Sardines canned with their bones deliver 382 milligrams of calcium per 100 grams, and the National Institutes of Health puts canned salmon with bones at 181 milligrams per three-ounce serving against 325 milligrams for sardines. Skinless, boneless canned salmon drops to 60 milligrams, which is a substantial difference hiding behind two words on a label.
For anyone tracking calcium from food rather than supplements, our ranking of non-dairy calcium sources by absorption puts those numbers in a wider context.
This is the decision most people are actually making at the shelf, and it is more interesting than the usual advice suggests.
You may have read that white albacore is a marketing premium with nothing behind it. That is not what the data shows. Canned white albacore carries 0.862 grams of EPA and DHA per 100 grams against 0.224 for chunk light — nearly four times as much. If omega-3 content is what you are buying tuna for, albacore genuinely delivers more of it, and the higher price is not purely cosmetic.
What albacore also delivers is mercury. FDA sampling puts canned albacore at a mean of 0.350 parts per million against 0.126 for canned light, and the federal advice reflects that: canned light tuna, including skipjack, is listed as a Best Choice while albacore and white tuna sit a tier lower as a Good Choice. At the four-ounce serving FDA uses, that is roughly 39.7 micrograms of mercury from albacore against 14.3 from light.
So it is a genuine three-way trade-off rather than a con: more omega-3, more mercury, more money. Which way that resolves depends entirely on which of the three you care about most, and reasonable people land differently.
The more striking point is what happens when you widen the frame. Both tuna options are beaten on every axis simultaneously by mackerel and salmon, which carry more omega-3, less mercury, and cost less per gram of the thing you came for. The light-versus-white question is real, but it is a choice between fourth and fifth place.
Omega-3s are the reason this ranking exists, but they are not the only thing you are buying.
Vitamin D is the quiet one. USDA and Health and Human Services figures put canned light tuna at 231 IU per three-ounce portion and canned sardines at 164 IU, with salmon higher still, which places canned fish among the more substantial everyday food sources of a nutrient that is otherwise hard to get from a plate. It is one of the few areas where the lowest-ranking fish in our table performs well.
Protein is broadly even across the category, running between roughly 19 and 25 grams per 100 grams, so it is not a useful tiebreaker. And the calcium point from the bones is worth restating, because it is the single largest nutritional difference between two cans of the same fish sitting side by side on the same shelf.
Sodium is in this table to disqualify rather than to rank, and it does real work in that role, because the fish that wins the ranking is also the saltiest of the five.
Jack mackerel runs 379 milligrams of sodium per 100 grams, with salmon and albacore essentially level at 378 and 377. Sardines come in lower at 307, and chunk light tuna is the cleanest of the group at 247. For scale, FDA notes that average sodium intake in the United States is around 3,400 milligrams a day against a recommended limit of 2,300 for people aged fourteen and over, and that roughly nine in ten Americans exceed that recommendation.
A single serving of any of these fish is a modest contribution against that total. But the ranking's winner sitting at the top of the sodium column is exactly the sort of trade-off a one-axis list would hide, and it is worth weighing if sodium is something you already watch. No-salt-added versions exist for tuna and salmon, and rinsing drained fish removes a meaningful share of surface salt, both of which shift these numbers.
A few honest limits, because a table this confident-looking should carry them visibly.
The mercury figures describe species, not cans. FDA's numbers are means from sampling conducted between 1990 and 2012, and brand-to-brand variation within a species is real and documented. The table tells you what a fish tends to carry, not what is in the specific tin in your hand.
Some of those figures are also old. Every mackerel number in the FDA table traces to a 1978 National Marine Fisheries Service survey, or to a 2000 Gulf of Mexico report in the case of king mackerel, rather than to FDA's own later sampling — and the sample sizes are modest, at 80 fish for Atlantic mackerel and 30 for Pacific chub. They are the best federal numbers available and they are decades old, and both of those things are true at once.
Sample counts vary sharply elsewhere too. The canned salmon mercury figure rests on just 19 samples, against 545 for canned light tuna and 451 for albacore. That does not make salmon's low reading wrong, but it is a thinner foundation than the tuna figures stand on, and 0.014 parts per million should be read as an estimate rather than a precise value.
There is one seam in the sourcing worth flagging as well. FDA's table lists "sardine" generically, without specifying canned, while the nutrition figures come from a canned record — so the sardine row joins two datasets that do not match perfectly. Finally, prices move. The August 2026 snapshot here is reproducible because the retailer, the products and the date are all named, but the per-dollar figures will drift, and the ordering is the durable part.
About the Author
Angela Nightingale is a Senior Editor at Daily Vitality with over two decades of experience in digital publishing and health and wellness content. She specializes in turning complex, often-confusing health topics into clear, calm, and practical guidance that respects the reader's intelligence. Her work focuses on helping people feel informed and confident — never overwhelmed or alarmed — as they make everyday decisions about how they eat, move, rest, and age.
Canned jack mackerel, by a wide margin. At the prices sampled it delivered about 2.12 grams of EPA and DHA per dollar, against 1.01 for canned pink salmon, 0.77 for sardines, 0.62 for albacore tuna and 0.33 for chunk light tuna.
Very much so. Sardines carry the lowest mercury of any fish in this comparison and slightly more omega-3 per gram than salmon. They placed third only because the small 3.75-ounce tin is an expensive format, not because of anything to do with the fish.
It depends which axis matters to you. Albacore carries nearly four times the omega-3 of chunk light tuna, which is a real difference, but also roughly 2.8 times the mercury and about double the price. FDA and EPA list canned light tuna as a Best Choice and albacore as a Good Choice.
Because they are different species with different lifespans, sizes and diets. Larger, longer-lived predators accumulate more mercury. FDA figures range from 0.05 parts per million for Atlantic mackerel to 0.73 for king mackerel, and federal advice places them in three different categories as a result.
The species is usually printed on the label, though not always prominently — look for "jack," "Atlantic," "chub" or "Spanish" near the product name or in the ingredient list. King mackerel is rarely sold canned in the United States, and is more often encountered fresh or as steaks.
Some of them, yes. USDA records show canned pink salmon dropping from 0.718 grams of EPA per three-ounce portion with liquid and bones included to 0.284 grams once drained. Fish packed in water or its own juices loses less this way than fish packed in oil.
For these species it holds up well. Canned jack mackerel and canned salmon sit in the same range as their cooked fresh equivalents in USDA records, because canning is a sealed process and the fatty acids are relatively stable.
They are soft, edible and are where most of the calcium comes from. Sardines with bones carry 382 milligrams of calcium per 100 grams and canned salmon with bones about 280, while skinless boneless canned salmon drops to around 60.
FDA points to the Dietary Guidelines for Americans, which recommend at least 8 ounces of seafood a week on a 2,000-calorie diet, and advises those who are pregnant or breastfeeding to eat 8 to 12 ounces a week from lower-mercury choices. Those figures and the advice behind them are FDA and EPA's; their guidance page has the full detail, including specific advice for children.
