Bluefin vs Yellowfin Tuna in Sushi

Bluefin is the fatty, rich tuna prized for chutoro and otoro. Yellowfin is leaner, milder and firmer — almost all akami. Bluefin costs much more; yellowfin is what you usually get in budget sushi, poke and seared dishes.

At a glance. Bluefin: high fat, deep red to burgundy flesh, rich umami, the source of true otoro. Yellowfin: lean, light red to pink, mild, firm — a whole fillet is essentially akami. Price: bluefin is far more expensive.

Taste and texture

Bluefin is fattier with a much richer umami flavour, and its belly develops the heavy marbling of otoro. Yellowfin is milder and lighter, and firmer in texture — some diners prefer it for exactly that reason.

Fat and toro

Only bluefin develops a true ultra-fatty otoro belly. Yellowfin's belly is tasty but doesn't get that fatty, and yellowfin rarely has a true chutoro equivalent. A 100g serving of yellowfin has about 25g of protein and under 1g of fat, according to one seafood supplier.

Bigeye: the middle ground

Bigeye tuna sits between the two. It has more fat than yellowfin and can produce a chutoro — one reference puts bigeye chutoro at up to 25% fat and bigeye akami at about 14%.

How to tell on a menu

Menus in Hong Kong may say 本鮪 / hon-maguro (bluefin), 黑鮪 (bluefin), キハダ / 黃鰭 (yellowfin) or メバチ / 大眼 (bigeye). "Tuna" alone at a HKD 12 plate is usually not bluefin. Sushiro's platters list longfin tuna in some sets. Ask at a counter.

Want the bluefin experience cheaply? Try one piece of chutoro at a mid-range counter lunch rather than a full otoro plate. See tuna cuts explained.

Pick by dish: nigiri and toro → bluefin · poke, tataki, seared → yellowfin · budget sushi → yellowfin, bigeye or longfin.

Mercury: Hong Kong's Department of Health advises pregnant and breastfeeding women to avoid bluefin, bigeye, albacore and yellowfin tuna, and the Centre for Food Safety notes that for albacore and yellowfin the methylmercury risk outweighs the omega-3 benefit for these groups.

Common questions

Is bluefin better than yellowfin?

Richer and fattier, but "better" depends on taste.

Is otoro always bluefin?

True otoro usually is.

Where else can I look?

See our sushi fish guide.

Compiled by our editorial team from Japanese seafood and sushi references, chef-informed tuna guides, Hong Kong Centre for Food Safety and Department of Health guidance, and chain menus, retrieved September 2026. Fat percentages are approximate and vary by fish, season and source. General information only, not medical or dietary advice.