Masago is the salt-cured roe of capelin, a smelt-family fish, and most people know it as the orange coating on inside-out rolls. It costs less than tobiko, which puts it at the bottom of the common roe price ladder.
California rolls use it, and so does gunkan maki. The roe itself is pale yellow, so it gets dyed orange, red, black or green before it reaches the plate.
Production differs too, and egg size is the reason. Ikura eggs are separated from connective tissue by hand on a steel grid. Capelin eggs are small enough for machine separation (Vasconi et al., Foods, 2020).
What Is Masago in Sushi?
It’s capelin roe, and what it adds to sushi is color and a fine, sandy crunch at a lower price than tobiko.
Just One Cookbook says the Japanese name translates to “true sand,” which suits eggs the size of grains.
Menus and suppliers also call it capelin roe or smelt roe. “Flying fish eggs” on a menu can mean masago or tobiko, so that phrase settles nothing.
The fish is capelin (Mallotus villosus), a small forage fish in the smelt family. Masago works as a topping or an outer coating, sometimes just a garnish, and almost never as the main ingredient. Its price sits at the budget end of the roe range, below tobiko and far below caviar.
The name on the box does not guarantee one species. A frozen red masago in the PS in foodservice wholesale database lists 45% capelin roe and 43% herring roe, so the ingredient line decides what you are eating.
Where Does Masago Come From and How Is It Made?
Fishers target female capelin that are full of eggs but have not yet spawned (Healthline). Capelin is a sardine-sized fish of the North Atlantic, North Pacific and Arctic waters.
From catch to finished roe
Boats catch capelin with purse seines and pelagic trawls, the gear used in Iceland’s MSC-certified capelin fishery. Plants then sort the catch, freezing females for the Japanese market and sending males to Eastern Europe. Roe is cut out of mature females and frozen on its own. The cure comes last, when producers add salt, sugar, soy sauce, mirin and color.
Timing is the tight part. At Sildarvinnslan’s plant in Neskaupstadur, Iceland, roe processing starts only after the frozen whole-capelin run for Japan ends, once the roe reaches the maturity buyers want (Fiskerforum).
Is masago always capelin roe?
Not quite. Some guides say Japanese masago comes from shishamo. Shishamo (Spirinchus lanceolatus) is a separate smelt found along Hokkaido’s Pacific coast, according to Japan’s Ministry of Land, Infrastructure, Transport and Tourism.
Hokkaido researchers report that shishamo catches there have dropped sharply (Hokkaido Research Organization). Commercial masago specifications name capelin, and Medical News Today notes that the word can also cover roe from other smelt.
Capelin fishing and sustainability concerns
Sustainability depends on where the roe was caught, since each major capelin stock is assessed on its own. The latest advice is weak for the Barents Sea and cut for Iceland, and Canada’s stock is rated red.
| Region | Latest assessment | Source |
|---|---|---|
| Barents Sea (Norway, Russia) | Maturing biomass of 60,000 tonnes, lowest since 1987 and the second lowest on record; zero catch advised for 2027 | Joint Norwegian-Russian Arctic Fisheries Working Group, October 2026 |
| Iceland | Interim advice of 105,773 tonnes for 2026/27, down 70% from the initial advice of 358,044 tonnes issued in June | Marine and Freshwater Research Institute and Greenland Institute of Natural Resources, October 2026 |
| Canada (Northwest Atlantic) | Red rating (avoid) | Seafood Watch |
The same Barents Sea group’s December 2025 assessment had put maturing biomass at 123,641 tonnes, the lowest since 1995, and advised zero catch for 2026.
Seafood Watch ties the Canadian rating to depleted North Atlantic stocks and bycatch of Atlantic cod, herring and salmon. Iceland’s October figure is only interim advice. Storms and sea ice kept survey vessels from covering the northern part of the stock’s range, so the stock may be underestimated, and final advice follows the winter survey in January and February 2027.
Capelin feeds cod, seabirds, seals and whales (Healthline), so a weak stock reaches other species too. Origin on the label tells you more than the word masago does.
What Does Masago Taste and Feel Like?
Mild salt, a faint sweetness, and a fine sandy texture that doesn’t pop the way larger roe does.
The eggs are among the smallest used in sushi, so the bite is granular. Toast’s sushi guide calls that pleasant, a contrast against soft rice and fish.
Comparison articles tend to call it softer than tobiko, with no signature pop and a slightly more bitter taste (Food Republic, Medical News Today). Product descriptions go the other way and say crunchy or crispy with a pleasant bite (Marky’s, Fisherman’s Choice).
Both fit, really. The crunch is light and shows up as texture, not as a burst.
Part of the taste comes from the cure. Wholesale labels list sugar, salt, soy sauce and mirin, so some of the sweetness and savory edge is seasoning, not roe.
In a roll, that reads as background flavor. The Daily Meal notes that the mild salt adds flavor without overwhelming the dish.
Why Is Masago Orange?
Producers dye it. The natural shade is pale or dull yellow, according to Healthline and Food Republic.
Take a wholesale spec for Fisherman’s Choice MSC Masago orange, an Icelandic-origin product. It lists 88% capelin roe, then sugar, salt, soy sauce, mirin and the colors E110 and E129 (PS in foodservice).
E110 is the EU code for sunset yellow, which the FDA lists as FD&C Yellow No. 6. The FDA treats it as a certified color, so each batch goes to the agency for testing before use in food.
The Fisherman’s Choice specs use E110 and E129 for both orange and red masago. Black masago is sold as squid ink color, though one US wholesale listing from Marky’s names FD&C Yellow No. 6 and FD&C Red No. 40 in its ingredient line. Green uses E102 and E133 on the MSC green spec, and a second green-masago spec adds a wasabi flavouring listed as mustard and horseradish.
Read the ingredient line, not the product name or the sales blurb.
How Is Masago Used in Sushi?
Chefs press it onto the outside of inside-out rolls or spoon it over cut pieces, and some stir it into spicy mayo or wasabi mayo (Healthline). It also turns up in poke bowls, chirashi and Asian noodle dishes.
Masago is a regular on the California roll and on many other kinds of sushi rolls, mostly for color. Inside-out rolls show it best because the rice sits on the outside.
On nigiri, a strip of nori forms a small cup around the rice so a mound of roe can sit on top, according to The Daily Meal. That battleship shape is called gunkan maki.
Adding masago to a roll at home
- Defrost frozen masago as the package directs. Wholesale specs list it as ready to eat once thawed.
- Season freshly cooked short-grain rice with sushi vinegar while it is still warm.
- Roll an inside-out roll, such as a California roll, with the rice on the outside.
- Cut the roll into pieces with a sharp knife.
- Spoon masago onto each piece, or press the uncut roll into a plate of roe for a full coat.
Masago adds little flavor of its own, so it will not rescue a bland roll.
How Does Masago Differ From Tobiko, Ikura and Caviar?
It’s smaller, softer and cheaper than tobiko, and it sits at the bottom of the roe price ladder, below ikura and caviar.
| Attribute | Masago | Tobiko | Ikura |
|---|---|---|---|
| Source fish | Capelin | Flying fish | Salmon |
| Egg and texture | Tiny, sandy, soft crunch | Small, firm, audible crunch | Large, gooey, bursts |
| Flavor | Mild, salty, slightly bitter | Smoky, sweet, salty | Briny, slightly sweet |
| Price tier | Lowest | Medium-high | High |
The size gap is bigger than the table shows. A University of Milan analysis of processed roes found that a salmon egg averaged 217.3 mg and a capelin egg 0.7 mg (Vasconi et al., Foods, 2020).
Texture and flavor notes follow Food Republic. Price tiers follow Bacalalo’s 2026 comparison.
Telling masago from tobiko
Food Republic and Just One Cookbook give different diameters for tobiko, so size is a weak test. Texture and price decide it. Tobiko crunches, while masago is soft and sandy.
Dull, clumpy or soft roe on a cheap roll labeled tobiko is most likely dyed masago (Bacalalo). Just One Cookbook adds that many sushi restaurants swap in masago to save money.
The guide to tobiko on sushi menus covers the flying fish side of the comparison.
Is masago caviar?
No. Codex Alimentarius reserves the name caviar for sturgeon roe, so masago and other fish roes count as caviar substitutes (Vasconi et al., 2020).
Substitutes sell at lower prices while borrowing caviar’s appeal. Some producers dye roe black to resemble sturgeon eggs.
Masago Nutrition Facts
Seasoned masago adds few calories and little protein per serving. Sodium is where it costs you.
USDA FoodData Central lists plain roe (mixed species, raw) at 143 kcal, 22.3 g protein, 6.4 g fat and 91 mg sodium per 100 g. The University of Milan analysis of capelin roe (Foods, 2020) found 8.1 g protein and 4.5 g lipid per 100 g. A Tetsujin product sheet for seasoned orange masago, based on a 15 g serving, shows 340 mg sodium (14% of the Daily Value), 3 g sugars (2 g added), 40 mg cholesterol and 1 g protein.
Most nutrition guides lean on the USDA mixed-species figure. Healthline’s 6 g of protein per ounce traces back to it, while measured capelin roe holds roughly a third of that protein level.
The sodium gap is wider. At 340 mg per 15 g, the label works out to about 25 times the sodium of the same weight of raw roe (roughly 14 mg by the USDA figure), so the cure supplies most of the salt.
Omega-3 fatty acids are the largest fatty acid group in capelin roe (Vasconi et al.), but the roe carries little fat overall. A garnish-sized spoonful adds a small amount.
The rice, fish and sauce around the roe are a separate question, covered in the guide on whether sushi is healthy overall.
Is Masago Raw, and Is It Safe to Eat?
It’s raw roe that has been salt-cured, not cooked, and it is sold chilled or frozen.
Is masago pasteurized?
WebMD says most masago on sale has been pasteurized. Product and lab sources are less sure. JJ Foodservice, a UK supplier, describes its masago as raw and quick-frozen, and the Milan researchers describe processed roes as ready-to-eat products sold under refrigeration, with mild pasteurization used for some, such as lumpfish roe.
Treat masago as raw unless the label says pasteurized.
Is masago safe during pregnancy?
FoodSafety.gov tells pregnant women to avoid raw seafood, sushi included, because of parasites and Listeria.
Pasteurized masago from a labeled source is the lower-risk case. Unlabeled masago falls under the raw-seafood warning, so check with an obstetrician first.
What keeps masago safe on the shelf?
Salt alone does not do it. The FDA suggests a water phase salt level above 3.5% to hold back botulism spores, and the capelin roe in the Milan survey measured 2.9%.
The authors point to low refrigeration temperatures as the safeguard. No roe sample in the survey tested positive for Listeria monocytogenes.
Who Should Skip Masago?
Anyone with a fish or roe allergy should skip it, and so should people told to restrict sodium. If you avoid specific colors or flavor enhancers, read the label closely.
Fish and roe allergy
Roe allergy is documented and can occur without a fish allergy. A 2003 report in Annals of Allergy, Asthma and Immunology described severe reactions to roe in people with no concomitant fish allergy.
The suspected trigger is vitellogenin, a yolk protein. Japanese researchers writing in Allergology International (2020) identify its beta-prime component as a major antigen for patients who react to various fish roes.
A 2015 French pediatric report in Revue Francaise d’Allergologie described children who reacted to salmon or trout roe but tolerated fish flesh. The authors advised them to avoid the eggs of all fish species, because vitellogenin shares epitopes across species.
These studies covered whitefish, trout, salmon and pollock roe, not capelin roe. The French authors’ rule is the practical one.
Salt, sugar and additives
Count the masago together with the soy sauce on the plate when you add up sodium. The soy sauce in JJ Foodservice’s spec also brings soy and wheat allergens in alongside the fish.
The same spec carries an EU warning for E110 about effects on activity and attention in children, and FDA’s 1995 Federal Register notice on FD&C Yellow No. 6 labeling discusses reports of allergic-type reactions to the dye. E621 is monosodium glutamate, which some people link to headache or flushing, though Healthline notes little quality evidence.
Healthline lands in the same place. Skip masago with a seafood allergy, cut back with high blood pressure, and otherwise enjoy it.
How to Choose, Buy and Store Masago
Buy frozen masago from a seller that prints the species, origin, ingredients and thaw instructions, and keep it frozen until the day you use it.
What to read on the label
Look for capelin roe by name, not only “masago” or “smelt roe,” and a named catch area instead of a blank. Check for E621 (MSG) and any other E-numbers, and for fish, soy and wheat in the allergen line.
Japanese and Asian grocery stores are the usual source, according to MasterClass and Izzy Cooking. Foodservice suppliers such as JJ Foodservice in the UK and Tetsujin in the US list it by the pack or case with a full ingredient panel.
How long does thawed masago keep?
Published windows run from 48 hours to 5 days, depending on who is writing.
JJ Foodservice’s spec is the strictest. It limits defrosted product to 48 hours below 7 degrees C and says not to refreeze it. Izzy Cooking gives about 4 to 5 days in the refrigerator once thawed, and Bacalalo says 2 to 3 days once opened.
Use the window printed on your package. With none, treat 48 hours as the working limit, since it is the shortest published and comes from a supplier spec.
Thaw in the refrigerator, never at room temperature (Bacalalo).
Masago FAQ
What is masago sauce?
A creamy sauce built around the roe and most often tossed with Japanese-style spaghetti. Izzy Cooking describes it as masago folded into a light cream sauce.
Other recipes blend the roe with soy sauce, rice vinegar, sugar and sometimes mayonnaise, according to WebstaurantStore.
Can children eat masago?
Yes, in small portions, as long as the child has no fish or roe allergy. Acibadem International notes that portion size, sodium and food safety still matter for children.
The wider question is covered in the guide to whether kids can eat sushi.
Is masago gluten-free?
Not reliably. Seasoned masago often contains gluten, because the soy sauce in the cure is made with wheat, as the ingredient list in JJ Foodservice’s spec shows.
Read the label for wheat before serving.
Which roe works as a masago substitute?
Tobiko. Sellers such as Gourmet Food Store treat the two roes as interchangeable in recipes.
Tobiko brings a firmer crunch and a higher price, so the swap changes both texture and cost.
Sodium Sets the Limit on Masago Portions
Sodium should cap masago at about one 15 g spoonful per roll for anyone watching salt. A labeled spoonful of seasoned masago clears the FDA’s 140 mg “low sodium” ceiling more than twice over.
Four spoonfuls reach roughly 1,360 mg, about 90% of the 1,500 mg daily target the FDA gives adults with high blood pressure.
Settle the decisions in this order. Read sodium per serving on the label first, add the soy sauce on the plate next, and spoon the roe last, to whatever budget is left.
That sequence fixes the costs a diner cannot change before the garnish a diner controls.
The cost is looks, since a full outer coat uses more roe than a garnish spoonful, so color costs sodium. The portion math for the rest of the plate sits in the guide to how much sushi counts as too much.
