A true tuna in the family Scombridae. NOAA and the California portal use the species name Pacific Yellowfin Tuna, Thunnus albacares.
Southern California field dossier
Pacific Yellowfin Tuna
Thunnus albacares
- yellowfin tuna
- yellowfin
- ahi
A warm-water oceanic tuna distinguished by metallic blue-and-silver countershading, a yellow side stripe, yellow finlets, and the long bright-yellow dorsal and anal fins of adults.
Sources reviewed 2026-07-287 source records
- Long yellow sickle finsAdult second dorsal and anal fins extend into long bright-yellow sickles.
- Yellow finletsA row of small yellow finlets runs behind the dorsal and anal fins toward the tail.
- Yellow side stripeA yellow band separates the metallic blue upper body from the silver-yellow lower flank.
Verify current regulations before every tripSnapshot checked 2026-07-28. Follow the official links below for live rules, protected areas, licenses, and any in-season changes.
At a glance
Every factual card carries provenance
Highly migratory in tropical and subtropical open ocean, including Southern California when warm water extends into the region; NOAA notes a broad preference for warm water.
Adults feed high in the food web on fish, squid, and crustaceans.
Tuna rules and fillet-identification requirements apply, and cross-border trips can add Mexican licensing and documentation obligations. Verify every jurisdiction before departure.
Field dossier
Beginner-readable, source-deep
Read multiple features
Identification & look-alikes
Adult second dorsal and anal fins extend into long bright-yellow sickles. A row of small yellow finlets runs behind the dorsal and anal fins toward the tail. A yellow band separates the metallic blue upper body from the silver-yellow lower flank.
Use body shape, fin placement, color pattern, and the official California identification resources together. Never make a keep decision from one color mark or a count-category name alone.
Scale changes the silhouette
Size & growth
NOAA reports fast growth and adults reaching up to about six feet and 400 pounds, while most recreational encounters are smaller.
Match the forage class
Diet
Adults feed high in the food web on fish, squid, and crustaceans.
How the fish uses the water
Behavior
Yellowfin travel long distances, school in the open ocean, and can associate with concentrated forage and other surface activity.
Start with structure and water column
Habitat & depth
Highly migratory in tropical and subtropical open ocean, including Southern California when warm water extends into the region; NOAA notes a broad preference for warm water.
Availability is not a promise
Southern California seasonality
Southern California encounters depend strongly on warm-water incursions and offshore forage. A current count is evidence of a reported catch, not proof that every trip will find fish.
A source-backed starting point
Techniques & tackle
Hook-and-line and trolling are established pelagic methods. Build the plan around current water, verified counts, trip distance, and legal highly migratory species requirements.
Decide before the fish reaches the rail
Handling & release
Use tackle strong enough to land the fish without an exhausting fight, and keep a dehooker or suitable release tool ready.
If releasing, dehook in the water when possible. Never gaff a fish you plan to release, keep air exposure brief, wet your hands, avoid eyes and gills, and support the body rather than hanging the fish by its mouth.
Face a sluggish fish into the current until it can swim away under its own power.
Snapshot checked 2026-07-28
California regulations
Tuna rules and fillet-identification requirements apply, and cross-border trips can add Mexican licensing and documentation obligations. Verify every jurisdiction before departure.
Tuna rules and fillet-identification requirements apply, and cross-border trips can add Mexican licensing and documentation obligations. Verify every jurisdiction before departure.
Review the general ocean regulations for possession, filleting, gear, protected-area, and boat-limit rules before departure.
From species to a trip plan
No inferred targeting
Recent verified countsOpen the live count view. Missing source reports remain labeled, never converted to zero.
Live source states →Open tripsBrowse verified schedule inventory. Current beta inventory does not claim that a trip targets this species.
Targeting not yet verified →Landing sourcesInspect official count and schedule sources by Southern California landing.
Source directory →Boats reporting tripsSee boats present in verified schedule feeds. Species targeting is shown only when a source proves it.
Honest coverage →Citation & provenance ledger
7 sources used in this dossier
- Pacific Yellowfin Tuna species profileNOAA FisheriesOfficial NOAA appearance, biology, range, habitat, and fishery summary. NOAA states the page was updated July 6, 2026. Reviewed 2026-07-28.
- California Marine Species PortalCalifornia Department of Fish and WildlifeCurrent California common names, scientific names, and species aliases. Reviewed 2026-07-28.
- Southern Region ocean regulationsCalifornia Department of Fish and WildlifeOfficial current Southern Region season, size, bag, and possession summary. The page states it was updated July 1, 2026. Reviewed 2026-07-28.
- General ocean fishing regulationsCalifornia Department of Fish and WildlifeOfficial general limits, boat limits, gear rules, and fillet requirements. The page states it was updated July 24, 2026. Reviewed 2026-07-28.
- Marine Fish and Shellfish IdentificationCalifornia Department of Fish and WildlifeOfficial California identification hub, including rockfish groups and Southern California sport-fish references. Reviewed 2026-07-28.
- Catch and release fishing best practicesNOAA FisheriesOfficial handling and release guidance. NOAA states the page was updated September 3, 2025. Reviewed 2026-07-28.
- Ocean Sport Fishing hubCalifornia Department of Fish and WildlifeOfficial entry point for licenses, identification, current regulations, marine protected areas, advisories, and release guidance. Reviewed 2026-07-28.
Continue learning
Return to the guide for another dossier, or open the normalized count profile for the same species name.