A large, bright yellow fish with a large back fin.

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The Monterey Bay Aquarium lists mahi mahi from the US as "Best Choice" and other non-longline fished mahi mahi as a "Good Alternative", except for fish from Costa Rica, Guatemala and Peru. The MCS rates it as 2-3. As a large and badly monitored fish, it is potentially threatened, but in the absence of evidence for this, it is labeled as "sustainable".