Sea life

Yellowfin tuna

Thunnus albacares

A yellowfin tuna with a dark blue back, silver belly and long yellow fins swimming underwater

Photo: Unknown authorUnknown author · Public domain · via Wikimedia Commons

Where
Offshore
When
All year
Size
Commonly 10 to 50 kg, occasionally far more
Should I worry
Enjoy it
Harmless. Just very strong on the end of a line.

Boats head offshore in the morning, find the birds, then the dolphins, and under the dolphins there they are. A yellowfin of thirty kilos will take an hour to bring in and feed a table for a week.

Where you’ll see it

Well offshore, over deep water, often in the company of dolphins and diving birds. Sportfishing charters from the Papagayo coast target them year round.

What to know

The long yellow second dorsal and anal fins are the identifiers, growing longer as the fish gets larger. They are warm blooded, built for speed, and the reason the sashimi here is as good as it is. Local boats fish with rod and line, which is far kinder to everything else in the sea than the industrial alternative.

Questions people ask about this one

Why do fishing boats look for dolphins to find tuna?

In the eastern Pacific, yellowfin often swim beneath pods of spotted and spinner dolphins, for reasons nobody has fully explained. Find the dolphins and the tuna are frequently underneath. Costa Rican boats fish them with rod and line, not nets, so the dolphins are not harmed.

Wondering what else is out there?

Ask me on the call. I'll tell you what actually shows up in a Coco garden, what to do about it, and the one guy everyone rings when there's a boa in the roof.

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