Fish
Thunnus obesus
A tier
Thunnus obesus is bigeye tuna—high-fat tropical tuna with deep red flesh prized for sashimi and toro-like belly cuts when quality is high. Oil content exceeds many yellowfin lots; flavour is rich and clean if the fish was frozen or handled for raw use correctly. Sear rare, serve as sashimi, or grill steaks carefully. Prefer well-managed longline sources; bigeye faces significant fishing pressure. A sushi-counter luxury when graded properly.
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Characteristics
Preparations
Traits
Grading systems
Grades are placed along a shared scale so systems can be compared side by side.
History
Japanese sashimi markets elevated Thunnus obesus for fat and colour.
Global longline fleets expanded bigeye catch for sashimi export.
RFMO quotas and sustainability debates centred on Thunnus obesus stocks.