Short answer
Akami is the leaner loin, chutoro the mid-fat belly band, otoro the fattiest belly. Grade is about melt and price, not a hygiene score. Colour charts help compare raw fat bands under the counter light; they do not replace local seafood rules for raw service. For a hot sear, leaner loin browns faster than a thick belly cap. Do not treat a colour word as a doneness number, and do not invent an inspection certificate from a grade name.
Step by step
- Name the band — Match the piece to akami (lean loin), chutoro (mid belly) or otoro (fatty belly) on the atlas tuna chart.
- Read fat, not hygiene — Darker red lean meat is not safer than pale fatty belly. Grade is melt and price.
- Choose the cook — Raw service needs a trusted counter and local rules. Hot sear favours leaner loin for faster browning.
- Probe if cooked through — If you cook tuna hot, treat thickness like any steak — colour words are not temperatures.
Local note
English menus often keep Japanese band names — use the atlas tuna cuts to map them to loin versus belly.
Frequently asked questions
Is otoro safer than akami?
No. Otoro is fattier and usually costlier. Safety for raw fish is about handling and local rules, not the fat band name.
What is a tuna colour chart?
A teaching plate for fat bands under display light. It is not a doneness scale and not an inspection certificate.
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