Skipjack Tuna
Skipjack Tuna (Katsuwonus pelamis) is a saltwater species. The first thing to check: four to six bold dark horizontal stripes running along the belly — no other small tuna in the Atlantic has them. The look-alike to rule out is Little Tunny: false albacore have wavy worm-like marks on the back and fingerprint spots on the belly, never long horizontal stripes.
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| Scientific name | Katsuwonus pelamis |
|---|---|
| Also called | skipjack, arctic bonito, oceanic bonito |
| Water | Saltwater |
| Group | Tuna |
| Temperature | Concentrates between 68 and 84 °F. |
How to identify a Skipjack Tuna
- Four to six bold dark horizontal stripes running along the belly — no other small tuna in the Atlantic has them.
- A plain dark blue-purple back with no wavy markings and no oblique stripes.
- A scaleless body apart from the shoulder corselet and the lateral line.
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 |
|---|---|
| Little Tunny | False albacore have wavy worm-like marks on the back and fingerprint spots on the belly, never long horizontal stripes. |
| Atlantic Bonito | Bonito stripes run obliquely across the back, not horizontally along the belly, and bonito are fully scaled. |
Side-by-side comparisons
Read the full entry for Little Tunny and Atlantic Bonito.
Where it lives
Warm oceans worldwide, offshore over structure, temperature breaks and weed lines, often mixed into the same surface schools as little tunny and bonito.
Temperature
Concentrates between 68 and 84 °F.
The conditions that matter
Skipjack ride the same edges as the other small tunas — a colour change, a rip, a warm break holding bait. Because all three mix and are constantly confused, the belly is the only check worth making: horizontal stripes low on the flank means skipjack, every time.
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 skipjack 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.