Bigeye Tuna
Scientific Name: Thunnus obesus | Category: saltwater
The bigeye tuna is a broad-shouldered pelagic powerhouse, built for endurance in the open ocean. Its deep, fusiform body is covered in dark, metallic blue-black on the back, fading to a silvery white belly, often with a distinctive iridescent lateral band. While similar to the yellowfin, the bigeye is distinguished by its unusually large eyes (giving it its name), proportionally larger head, and a liver striated with fine lines, not solid. These are substantial fish: adults commonly range from 100 to 200 pounds, with true giants exceeding 400 pounds, making them one of the larger tuna species an angler can reasonably target. You'll find bigeye tuna in the deep, cool, blue waters of tropical and subtropical oceans worldwide. They are true wanderers of the abyssal zones, often holding over seamounts, ocean ridges, or the thousand-fathom curve. Unlike their yellowfin cousins that chase baitfish to the surface, bigeyes are deep dwellers, frequently found between 600 and 1,500 feet, where the water is colder. Premier fisheries include the canyons off the Northeast United States, the Azores, Bermuda, and the waters around Hawaii and Madeira. Targeting them is a game of offshore electronics, temperature breaks, and deep-dropping. Anglers book trips for bigeye tuna for the ultimate heavy-tackle challenge and the pursuit of a true bluewater trophy. When hooked, they are renowned for their deep, dogged, and unstoppable power runs, testing every piece of gear and an angler's stamina. They are a pinnacle species for the big-game crowd, offering a fight that is less acrobatic but more brutally powerful than a yellowfin. Their rich, dark red flesh is considered some of the finest sashimi-grade tuna in the world, adding a culinary prize to the battle. To land a bigeye is to conquer one of the ocean's most formidable and deep-dwelling gladiators.
species.getBySlug
{
"id": "e28903c6-509e-4bb2-b3d0-bb908c314371",
"commonName": "Bigeye Tuna",
"scientificName": "Thunnus obesus",
"slug": "bigeye-tuna",
"category": "saltwater",
"aliases": [
"bigeye",
"Big Eye",
"Tuna Obesus",
"Deepwater Tuna",
"Ahi (in some regions, though often confused with yellowfin)",
"Bluefin's Cousin (slang)",
"Goggle-eye",
"Megalodon of the Deep (fisherman's hyperbole)"
],
"description": "The bigeye tuna is a broad-shouldered pelagic powerhouse, built for endurance in the open ocean. Its deep, fusiform body is covered in dark, metallic blue-black on the back, fading to a silvery white belly, often with a distinctive iridescent lateral band. While similar to the yellowfin, the bigeye is distinguished by its unusually large eyes (giving it its name), proportionally larger head, and a liver striated with fine lines, not solid. These are substantial fish: adults commonly range from 100 to 200 pounds, with true giants exceeding 400 pounds, making them one of the larger tuna species an angler can reasonably target.\n\nYou'll find bigeye tuna in the deep, cool, blue waters of tropical and subtropical oceans worldwide. They are true wanderers of the abyssal zones, often holding over seamounts, ocean ridges, or the thousand-fathom curve. Unlike their yellowfin cousins that chase baitfish to the surface, bigeyes are deep dwellers, frequently found between 600 and 1,500 feet, where the water is colder. Premier fisheries include the canyons off the Northeast United States, the Azores, Bermuda, and the waters around Hawaii and Madeira. Targeting them is a game of offshore electronics, temperature breaks, and deep-dropping.\n\nAnglers book trips for bigeye tuna for the ultimate heavy-tackle challenge and the pursuit of a true bluewater trophy. When hooked, they are renowned for their deep, dogged, and unstoppable power runs, testing every piece of gear and an angler's stamina. They are a pinnacle species for the big-game crowd, offering a fight that is less acrobatic but more brutally powerful than a yellowfin. Their rich, dark red flesh is considered some of the finest sashimi-grade tuna in the world, adding a culinary prize to the battle. To land a bigeye is to conquer one of the ocean's most formidable and deep-dwelling gladiators.",
"imageUrl": "https://media.meridiaoutdoors.com/media/species/bigeye-tuna/main.webp",
"hero": {
"blurhash": "UgQJflM{t8xuRjRjt7of~qxuayof_3xuRjae",
"altText": "Bigeye Tuna (Thunnus obesus) watercolor",
"caption": "The bigeye tuna is a broad-shouldered pelagic powerhouse, built for endurance in the open ocean.",
"width": 2400,
"height": 1340
},
"phases": [
{
"id": "4ec53cd0-7d7b-4907-89f9-ad14776ffeb7",
"name": "Adult",
"slug": "adult",
"description": "The bigeye tuna in its adult form is an apex pelagic predator, cruising the deep, cold waters of the open ocean. This life stage is defined by endurance hunting over seamounts and continental slopes, where it capitalizes on the deep scattering layer of squid and fish. It's a life of constant movement in the blue abyss, a master of the mesopelagic zone.",
"appearance": "A broad-shouldered, fusiform body with a maximum girth behind the head, tapering to a narrow caudal peduncle. The back and upper sides are a dark, metallic blue-black, sometimes appearing almost charcoal, with a sharp transition to a silvery-white belly. A faint, iridescent lateral band runs from the gill plate to the tail. The pectoral fins are remarkably long, often reaching beyond the second dorsal fin origin. The most defining feature is its proportionally massive, dark eye, set in a large head. The finlets are dark yellow, fading to gray, and the dorsal and anal fins are dusky. Liver is striated (visible upon cleaning). Adults typically range from 100 to over 400 pounds, with a thick, powerful build.",
"triggers": null,
"habitat": "Deep, cool, oxygen-rich waters of tropical and subtropical oceans worldwide, typically between 600-1500 feet. Found over seamounts, oceanic ridges, and the continental slope, often associated with the thermocline.",
"anglersNote": "This is the primary target phase for trophy big-game anglers, offering an incredibly powerful, deep-fighting challenge on heavy tackle. The fight is less about aerial displays and more about sheer, unstoppable power.",
"displayOrder": 0,
"imageUrl": null,
"media": null
},
{
"id": "783dfc0d-837d-4aac-8fde-f2590b02344d",
"name": "Juvenile/Sub-Adult",
"slug": "juvenile",
"description": "Young bigeye tuna are schooling fish, living a faster-paced, more vulnerable existence in shallower, warmer mixed layers. They often mix with schools of similar-sized yellowfin or skipjack tuna, feeding aggressively on small baitfish and crustaceans near the surface to fuel their rapid growth.",
"appearance": "A more streamlined and slender version of the adult, lacking the deep, broad shoulders. Coloration is brighter and more contrasted: a vibrant dark blue on the back, with a sharp, clean lateral line and a brilliant silver-white belly. The distinctive large eye is still present but proportionally less dominant. Vertical tiger-stripe markings (sometimes called 'picket fences') or rows of elongated spots are often visible along the lower flank, similar to a young yellowfin. These markings fade with age. Pectoral fins are long but not yet as pronounced. Typically found under 50 pounds.",
"triggers": "Hatching from eggs and surviving the larval stage in surface waters.",
"habitat": "Warmer surface and sub-surface waters, often above the thermocline. Found around floating debris, current lines, and in mixed-species tuna schools in offshore waters.",
"anglersNote": "Anglers may encounter these smaller fish while trolling or chunking for other species. They provide exciting light-tackle sport but are often released to grow into the prized trophies.",
"displayOrder": 1,
"imageUrl": null,
"media": null
}
],
"contentUpdatedAt": "2026-05-09T22:30:22.111Z"
}species.getDestinations (0)
[]
faqs.getByEntity (0)
[]
seo.getBySlug
{
"title": null,
"description": "Bigeye tuna are deep-dwelling pelagic predators found in tropical and subtropical oceans. Target them for a powerful heavy-tackle bluewater challenge.",
"h1Override": null,
"canonicalUrl": null,
"robots": null,
"ogTitle": null,
"ogDescription": "Encountering a bigeye tuna means a serious heavy-tackle battle. Learn about these deep-dwelling giants of the open ocean and how anglers pursue them.",
"ogImage": null,
"ogType": null,
"twitterCard": null,
"focusKeyword": "bigeye tuna fishing",
"secondaryKeywords": [
"bigeye tuna",
"thunnus obesus",
"saltwater",
"bigeye",
"big eye",
"tuna obesus",
"deepwater tuna",
"ahi (in some regions, though often confused with yellowfin)",
"bluefin's cousin (slang)",
"goggle-eye",
"megalodon of the deep (fisherman's hyperbole)"
],
"sitemapPriority": null,
"sitemapChangefreq": null,
"customMeta": null,
"redirectUrl": null,
"breadcrumbLabel": null
}