Magu Roll: Japanese Tuna Paper Explained (What It Does, How It's Used, Buying From Japan)

Why This Paper Exists: Japan's Tuna and the Minus 60°C Cold Chain

Japan eats about one-fifth of the world's tuna, by WWF Japan's count (2012 data). The Fisheries Agency of Japan estimates the 2024 supply at 308,000 tonnes, 167,000 of them imported, and about 80 percent of imported tuna arrives frozen (Toyomi Osakana Museum).

Distant-water longliners gill, gut and bleed each fish, freeze it at minus 60°C on board and hold it there to port; a home freezer runs at about minus 20°C (Japan Tuna Fisheries Co-operative Association). The reason is color. Tuna's red pigment, myoglobin, oxidizes over time to brown metmyoglobin; the Japan Association of Refrigerated Warehouses says storage at minus 20 to minus 30°C cannot prevent it, while minus 50°C or colder does — hence the roughly 400 ultra-low-temperature warehouses across Japan (J-Net21). Tuna is auctioned at Tokyo's central wholesale market — Tsukiji from 1935, Toyosu, a closed, temperature-managed building, since 11 October 2018 — from 5:30 a.m., fresh fish first, then roughly 1,000 frozen fish (Toyosu Market Association).

Past the auction the chain has a loose end. Daiso (大宗), a tuna dealer inside Toyosu Market, tells retail buyers a block "is likely around minus 20°C during transport", and then it thaws at home. Drip is the water from melted ice crystals carrying umami out of the tissue (Japan Frozen Food Association); Daiso warns that a wrong thaw "turns it black or loses umami", and Ohnaga, a Yaizu dealer, says room-temperature thawing brings drip, discoloration and off-odor. The market controls none of this. The buyer does.

The paper for that step comes from Miki Tokushu Paper Mfg. Co., Ltd. (三木特種製紙, Miki Tokushu Seishi), founded on 1 October 1947 by Gunji Miki as a machine-made washi works in Kawanoe-cho, Shikokuchuo, Ehime, still its head office; kitchen paper is a small line beside its filter papers, tape base paper, membrane supports and electrical insulating paper. Shikokuchuo has led Japan in pulp and paper shipments for 20 consecutive years since its 2004 merger, by the city's count from the national economic-structure survey, and the city says local mills can make any paper product except banknotes, stamps and revenue stamps. The name reads as maguro (tuna) plus roll — the maker also sells a Meat Roll — but no maker text explains it. The record is thin. No maker source gives a launch year, a developer, or who asked for the paper; the earliest dated maker statement we found is a press release of 7 October 2022.

What Magu Roll Is: Maker, Format, and the Six Features in the Maker's Words

The roll label reads まぐロール with an (R) mark and the sub-line 食品鮮度保持ペーパー, "food freshness-keeping paper". The maker's item code is MKT-10 and the JAN is 4962980300012, per the ASKUL listing. Listings that show "Unbranded" or "no-brand" are printing a reseller's field; the brand is まぐロール and the maker is Miki Tokushu.

The maker's specification, per roll: natural pulp; 230mm x 40m; 170 sheets, perforated every 23cm, which makes each sheet about 230mm x 230mm, the figure printed on the package. Made in Japan — "fully domestic production", in the maker's copy. The two-roll pack is a reseller bundle; the maker sells single rolls and cases of 20.

The maker's infographic lists six features. In its words, translated:

1. Safe (安全). According to the maker: no harmful substances, no paper-dust shedding, hygienic and safe.
2. Prevents discoloration (変色防止). The maker says it absorbs blood and moisture at a moderate rate, which is how the food keeps its color.
3. Freshness (鮮度). The maker describes it as keeping the freshness of tuna in particular, thawed tuna, and raw or frozen meat.
4. Moisture retention (保湿). According to the maker, moisture retention is added to balance absorbency, and breathability prevents drying.
5. Many uses (用途いろいろ). As cooking paper: a liner for tempura and fried food, wiping the cutting board, cleaning the frying pan.
6. Absorbency (吸水). The maker's headline use: it absorbs the drip released during thawing, with the same absorbency offered for other seafood and meat.

The maker also says it is used in sushi restaurants, ryotei and fish shops; what we can confirm independently is narrower — a packaging-supplies shop inside Toyosu Market lists it among its food papers. Every effect is explained physically, as absorbing blood and drip and balancing moisture; no coating or additive is described. On food contact, the maker's copy says the paper is "manufactured as a food-use sheet, so it may be used where food touches directly, such as plates and cutting boards" — a statement of intended use, not a certificate, since Japan issues no food-grade mark for paper. No source states a ply count, a paper color, or a per-roll weight; the paper is white in the maker's photos.

Featured Made in Japan 2 rolls x 170 sheets

Miki Tokushu Paper Mfg. (三木特種製紙)

Magu Roll Food Freshness-Keeping Paper (まぐロール MKT-10), 2 Rolls x 170 Sheets

Natural-pulp food-contact paper, 230mm x 40m per roll, 170 perforated sheets of about 230mm x 230mm. Made in Japan by Miki Tokushu Paper Mfg., Shikokuchuo, Ehime. The maker's headline use: absorbing the drip released as frozen tuna thaws.

2,600 JPY · base price for 2 rolls (about US$17)

Details

2,600 yen base price for two rolls (about US$17 in September 2026), shown in your currency on the product page.

How It Is Used, Step by Step

The routines that Toyosu, Misaki and Yaizu tuna dealers publish for their customers end the same way: pat dry, wrap in paper, rest in the fridge. None names a paper brand. Magu Roll is a paper its maker built for that step. The maker gives no times or temperatures; the numbers are the dealers' own, and each carries its dealer's name.

Thawing a frozen tuna block (saku): the routine Japan's tuna dealers publish

Three dealers publish their method: Daiso, a tuna wholesaler inside Toyosu Market; Ya-jirushi (や印), a Misaki wholesaler in business for 80 years by its own account; and Ohnaga Masuda Shoten in Yaizu. The skeleton is the same in all three.

1. Unwrap and rinse in salt water. Daiso says to start about two hours before eating, unwrap the block, and wash it in salt water at about 30°C, "seawater strength", for 3 to 5 minutes, until the saw cuttings are gone and the surface begins to thaw. Ya-jirushi uses 30 to 40°C water with about 36 g of salt per liter for 1 to 2 minutes; Ohnaga, 35 to 40°C with 30 g per liter for 30 seconds to a minute. The salt, a Toyosu-based seller explains, uses osmotic pressure to limit the loss of drip and umami.
2. Rinse in fresh water. Daiso and Ya-jirushi both rinse the brine off.
3. Pat dry. All three wipe the surface with paper.
4. Wrap in paper. This is where the sheet goes. Ohnaga's reason: "tuna gives off drip while thawing, so wrap it in paper towel". Ya-jirushi wraps the block in moistened paper so it does not touch air; Daiso and Ohnaga do not say to dampen it, and the maker gives no instruction either way. According to the maker, Magu Roll absorbs the drip that comes out of frozen tuna as it thaws. One sheet, torn at the perforation, wraps one block.
5. Rest in the refrigerator. Not the freezer, Ya-jirushi adds. Ya-jirushi puts the wrapped block in a container; 魚河岸ウォーカー, a Tsukiji-market media site, sets it on a plate under loose cling film. Times differ: Ya-jirushi gives about 20 minutes for a 250 g block, until a knife goes in; Ohnaga about 2 hours; 魚河岸ウォーカー half a day to a day.
6. Cut while still firm. Ohnaga cuts it half-frozen; Daiso slices only what will be eaten and re-wraps the rest.
7. Never refreeze; eat that day. Daiso and Ohnaga both say so.

The times disagree because block size and the firmness the cook wants decide them, and the maker makes no recommendation. A sheet that has taken up drip is discarded; the perforated roll keeps the next one at hand.

Storing fresh fish and meat wrapped in it

The same wrap is a Japanese home habit for fish that was never frozen. The Japan Fisheries Association's fish-promotion center says wipe the fish, wrap it in cooking paper to take up drip, then film it and refrigerate — the basics, it says, are the same in a plant and at home. Asahi Kasei, maker of Saran Wrap, gives the same order and adds "store near 0°C". The maker's features 3 and 4 cover this use: keeping the freshness of tuna, thawed tuna and raw or frozen meat, with moisture retention and breathability against drying. The maker gives no number of days and neither do we; the dealers say eat thawed tuna the same day, and for fresh fish held longer, the working rule anglers abroad give for any paper wrap is to change the sheet once it is wet. For meat, the same mill sells a wider sister product, Meat Roll, in 300mm and 600mm widths.

The everyday uses the maker lists: tempura liner, cutting-board wipe, frying-pan cleaning

Feature 5 is the maker's own list: a liner under tempura and fried food, wiping the cutting board, cleaning the frying pan. Feature 1 adds that the paper sheds no paper dust. The maker says nothing about ovens, microwaves or heat resistance, so neither do we.

What Paper Do Sushi Chefs Wrap Fish In? Magu Roll vs Paper Towel vs Pichit Sheet vs Green Parchment

Searches for the paper sushi chefs wrap fish in turn up four different things: the dealer routines say plain kitchen paper; the maker says its own paper is used in sushi restaurants, ryotei and fish shops; the green sheet seen in fish shops is a wet-strength parchment, a separate product; and the Pichit sheet is not paper at all but an osmotic film. Amazon Japan's "frequently bought together" pairs Magu Roll with both Pichit and green parchment, which fits how the sources describe them: different tools for different steps, and none replaces another.

What It Is Not, and Points to Note

The same record sets the limits:

• Not a food-safety measure. It does not make fish safe to eat raw; parasite rules and a block's freezing history are a separate matter.
• Not a dehydrating sheet and not an aging paper. Osmotic sheets pull water out through a membrane; green parchment is a flat wet-strength sheet for multi-day rests. Magu Roll is an absorbent pulp roll for the drip step.
• No shelf life in days. The maker gives none, wafuu's page gives none, and one fishing writer's anecdote is not a product property.
• No germ-killing claim. The maker does not claim the paper kills or inhibits anything; "hygienic" appears only inside its feature 1.
• Single-use. One sheet per wrap, discarded once it has absorbed drip.
• Not a substitute for film. The Japanese home routine puts film over the paper — the Japan Fisheries Association's fish-promotion center and Asahi Kasei both give that order. The paper takes up drip; it is not a seal.
• No heat rating. The maker says nothing about ovens, microwaves or heat resistance; its listed uses are a liner, a board wipe and a pan cleaner.
• Bulky to ship. About 0.84 kg for the two rolls (wafuu's page text and the Amazon Japan listing of the same two-roll set agree); the maker publishes no per-roll weight.
• Japanese-only packaging. The label and infographic are Japanese-only, and the maker's English site does not mention Magu Roll.
• Unverified marketplace fields. "2-ply" and "Color: Pink" appear on listings; no maker source states either.
• "Food sheet" is a statement of intended use, not a certificate; Japan's positive-list system for food-contact materials covers synthetic resins, not paper.

Food Safety Note: The Paper Does Not Make Fish Safe to Eat Raw

Magu Roll is a kitchen paper for managing drip and moisture: it does not kill parasites or bacteria, and whether a piece of fish is safe to eat raw depends on how it was sourced, frozen, labeled and handled under the rules of your country, not on what it is wrapped in.

The rules differ by country; the numbers do not merge. In the United States, the FDA Food Code (§3-402.11) requires fish served raw to have been frozen at -20°C for 7 days, or at -35°C until solid and held 15 hours, or at -35°C until solid then -20°C for 24 hours; the large tunas — albacore, yellowfin, blackfin, southern and northern bluefin, bigeye — are exempt, as are farmed fish raised on formulated feed; skipjack and every other wild fish are not. It is a model code for food establishments, not home kitchens. In the EU, Regulation 853/2004 (Annex III, as amended by 1276/2011) requires -20°C in all parts for at least 24 hours or -35°C for at least 15 hours, with exemptions for certain farmed fish. Japan's health ministry says freeze at -20°C for 24 hours or more, or cook to 70°C (60°C for one minute), and warns that vinegar, salt, soy sauce and wasabi do not kill Anisakis. Packaged cut fish sold in Japan must carry a label saying whether it is 生食用, for raw consumption.

The FDA's consumer page says pregnant women, children, older adults and the immunocompromised should avoid raw fish altogether, notes that "freezing doesn't kill all harmful germs", and advises thawing in the refrigerator overnight or sealed in cold water. The trade's minus 60°C exceeds every one of those thresholds, but a buyer cannot see a block's history: buy fish sold for raw consumption and follow its label. These rules assume monitored commercial freezers; a home freezer is not a substitute. The paper changes none of this.

Japanese Fish-Prep Tools on wafuu

The dealers' routine has a tool at each step. A deba breaks down a whole fish before anything is wrapped; a yanagiba slices the rested block while it is still firm; the hinoki board is the surface a sheet of Magu Roll wipes down between fish and vegetables; tongs lift slices without handling them; and shears deal with fins, skin and packaging. All five are made in Japan and ship from wafuu alongside the paper.

Slicing Made in Japan

KAI

KAI Sashimi Yanagiba Knife 240mm Stainless Steel Dishwasher Safe AK1135

Yanagiba sashimi slicer, 240mm, in one-piece stainless steel with no joint between blade and handle, so it washes clean and goes in the dishwasher. The knife for the step after the thaw: slicing the rested block while it is still firm.

Details

Breaking down Made in Japan

KAI

KAI Deba Knife SEKIMAGOROKU AK1131 150mm Made in Japan

Deba for breaking down whole fish: molybdenum-vanadium stainless blade, 18-8 stainless handle with a textured surface that keeps its grip when hands are wet. Made in Japan, one-piece build with no joins to trap water.

Details

Board Made in Japan

Kyoto-Katsugu

Kyoto-Katsugu Hinoki Wood Cutting Board Japanese Made Mino S 36x22cm

Straight-grain Tono hinoki from the Kiso region, 36 x 22 x 1.5 cm and 550 g, thin and light enough to lift to the sink; the straight grain is there to resist warping. The board a sheet of Magu Roll wipes down between fish and vegetables.

Details

Handling Made in Japan

Oaks laye

Oaks laye Yubisaki Tongs Made in Japan Stainless Steel

Fingertip-style stainless tongs made in Japan, with a soft grip and a light spring that moves the way fingers do. For lifting thawed slices and wrapped blocks without handling them; the floating tip keeps the counter clean when they are set down.

Details

Trimming Made in Japan

KAI

KAI Kitchen Scissors Stainless Steel Forged Detachable Japanese Made DH3345

Forged stainless kitchen shears from KAI, 20.7 x 7.5 x 1.2 cm, that come apart for washing. Serrated blades with a fine uneven edge stop the cut from slipping — useful on fins, skin and the packaging a tuna block comes in.

Details

Buying Magu Roll From Japan

2,600 yen base price for two rolls (about US$17 in September 2026), shown in your currency on the product page. The bundle is two rolls of 170 sheets — 340 sheets of about 230mm x 230mm.

Identify the product by its JAN, 4962980300012, and the まぐロール package rather than by a marketplace "brand" field, which often shows a reseller's name or "Unbranded".

Weight and bulk: about 0.84 kg for the two rolls (wafuu's page and the Amazon Japan listing of the same set agree). A bulky parcel for what it weighs, and it ships from Japan. The rest of wafuu's Japanese kitchen tools are in the kitchen tools collection.

Frequently Asked Questions

Final Verdict

Magu Roll suits home cooks who buy frozen tuna blocks and want the thaw handled the way Japan's dealers describe it, and small restaurants that wrap fish and meat daily and want a paper made for it rather than a household towel. In the maker's words, it absorbs the drip released during thawing, takes up blood and moisture at a moderate rate so the flesh keeps its color, and balances absorbency with moisture retention and breathability. It is a kitchen tool, not a food-safety measure, and it comes with no promise of days. The next step is short. Order the two-roll bundle from the product page; while it ships, pick the dealer routine that matches the block — Ya-jirushi's 20 minutes for a 250 g saku, Ohnaga's two hours, or the market writer's half-day rest — and buy a block sold for raw consumption, because the paper will not settle that.

Magu Roll Food Freshness-Keeping Paper (まぐロール MKT-10), 2 Rolls x 170 Sheets
2,600 JPY base price for 2 rolls (about US$17) · ships worldwide from Japan

View on wafuu