Yellowfin Tuna
Yellowfin tuna show up in Chilean offshore waters on the warm side of the Humboldt Current, where cooler upwelling water meets warmer open-ocean surface temps. They're a deep-water, blue-water target — not a fish you'll find inshore.
Anglers run out of ports like Iquique, Antofagasta, and Valparaíso to chase them, trolling or chunking over temperature breaks and submarine structure far offshore.
Scientific Name: Thunnus albacares
Also known as Atún aleta amarilla, Atún de aleta amarilla
- Torpedo-shaped body; metallic dark blue across the back fading to silver-white on the belly, with a faint yellow stripe along the sides.
- The giveaway ID feature: long, bright-yellow second dorsal and anal fins that extend well back toward the tail — much longer than on bluefin or bigeye.
- Small bright-yellow finlets run from the dorsal and anal fins to the crescent-shaped tail.
- Common fish run 20–80 kg; fish over 100 kg are exceptional. Maximum size reaches around 200 kg and over 2 meters.
What to know
Habitat Distribution
- Introduced to Chilean waters only by migration — yellowfin are not native residents but move into the eastern Pacific off Chile's coast seasonally, staying on the warm-water side of the Humboldt Current.
- Strictly offshore and pelagic; they roam the upper 250 meters of the water column, rarely approaching the coast.
- Most accessible from northern Chile — Iquique and Antofagasta — where warmer Pacific water pushes closer to shore; central Chile around Valparaíso also sees them.
- Concentrate around temperature breaks, upwelling edges, seamounts, and submarine ridges where bait schools stack up.
Key Locations
- Iquique — northern Chile's main offshore port; warm Pacific water pushes relatively close here, making it the most accessible departure point for yellowfin runs.
- Antofagasta — another northern port with access to offshore temperature breaks where yellowfin concentrate seasonally.
- Valparaíso — central Chile's largest port; yellowfin are reachable but require longer runs offshore to find warm enough water.
Specific Spots
- Temperature breaks — where cold Humboldt water meets warmer offshore surface water — are the single most reliable locator. Bait and tuna stack along these edges.
- Submarine structure like seamounts, ledges, and canyon edges concentrates bait and holds fish; sea surface temperature (SST) charts help pinpoint these zones offshore.
- Surface schools are often visible: look for birds working bait, or — in the eastern Pacific — dolphin pods, which frequently travel with yellowfin chasing the same bait schools.
- Chlorophyll breaks (color changes in the water visible from the surface or on satellite imagery) often overlap with temperature breaks and mark the most productive zones.
Yellowfin Tuna FAQ
Answers from onWater's species guide.
What are the best lures and bait for Yellowfin Tuna?
Skirted trolling lures in blue/white, pink/white, or black/purple, run at varied distances behind the boat, are the standard offshore spread. Cedar plugs and Rapala-style stick baits also produce when trolled through schools.
When is the best time to fish for Yellowfin Tuna?
Summer (December–February): peak season as warm water expands and fish are most active; coincides with spawning period. Autumn (March–May): fish can still be present as water cools gradually; quality can remain good early in the period.
How do you catch Yellowfin Tuna?
Anglers target yellowfin almost exclusively from offshore charter or private boats, running well offshore from northern ports like Iquique and Antofagasta to find warm water and temperature breaks.
What do Yellowfin Tuna eat?
Yellowfin feed on whatever bait is available at the surface and in the upper water column, small fish like mackerel and sardines, squid, and crustaceans. Matching the local bait size and color is more important than any single pattern.
Where do Yellowfin Tuna live?
Introduced to Chilean waters only by migration, yellowfin are not native residents but move into the eastern Pacific off Chile's coast seasonally, staying on the warm-water side of the Humboldt Current. Strictly offshore and pelagic; they roam the upper 250 meters of the water column, rarely approaching the coast.
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