Yellowfin Tuna
Yellowfin Tuna (Thunnus albacares) is a saltwater species. The first thing to check: bright yellow finlets edged in black running along the back and belly to the tail. The look-alike to rule out is Bigeye Tuna: bigeye have larger eyes, shorter finlets that never extend, and a body deepest nearer the middle. The long sickle fins of a mature yellowfin are decisive when present.
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| Scientific name | Thunnus albacares |
|---|---|
| Also called | ahi, allison tuna, yellowfin |
| Water | Saltwater |
| Group | Tuna |
| Temperature | Concentrates between 72 and 82 °F, tracking warm water edges and eddies. |
How to identify a Yellowfin Tuna
- Bright yellow finlets edged in black running along the back and belly to the tail.
- Very long, sickle-shaped second dorsal and anal fins on mature fish, sometimes reaching past the finlets.
- A golden-yellow lateral stripe on a metallic dark blue back, with pale vertical lines on the lower flank.
If you would rather not work through a key on a wet deck, photograph the fish and let the app name it — you get the common and the scientific name back, and the record is filed before you release.
Fish it is mistaken for
| Species | How to tell them apart |
|---|---|
| Bigeye Tuna | Bigeye have larger eyes, shorter finlets that never extend, and a body deepest nearer the middle. The long sickle fins of a mature yellowfin are decisive when present. |
| Blackfin Tuna | Blackfin have dusky black finlets rather than yellow, and short pectorals. |
Read the full entry for Blackfin Tuna.
Where it lives
Tropical and subtropical oceans worldwide. Found offshore over canyons, seamounts, rips, temperature breaks and floating structure, frequently with dolphin and birds.
Temperature
Concentrates between 72 and 82 °F, tracking warm water edges and eddies.
The conditions that matter
Yellowfin are found on offshore edges: a temperature break, a colour change where chlorophyll-rich green meets blue, and a current rip that concentrates bait. Crews plan trips off satellite temperature and chlorophyll imagery for exactly this reason, and having those two readings on every catch record is what turns one good day into a repeatable pattern.
Global Fishing League records 18 weather and water readings against every catch automatically — tide stage, barometric pressure, water temperature, salinity, dissolved oxygen, chlorophyll, swell, current, moon phase and more, taken at your GPS position at the moment you log the fish. Over a season that turns a hunch about yellowfin tuna into a pattern you can read.
See every reading recorded with a catch, or the guides to what each reading means.
Size limits, bag limits and seasons
Size limits, bag limits, slot limits and seasons are set by your state wildlife agency — and for many offshore and migratory species by federal regulators — and on many waters they differ from the statewide rule. They also change between seasons. Check the current regulations for the exact water you are fishing before you keep a fish — we do not republish limits here, because a number that is a season out of date is worse than no number.
What the app does do is make your side of it accurate: every catch carries a length measured from the photograph, a GPS position and a timestamp, exportable if you ever need to show your work for a tournament or a record claim. It is also what a Global Fishing League entry is built from — a record that verifies itself, without publishing where you caught the fish.