HomeFish encyclopediaRay-finned fishesPerch-like fishMackerels, tunas, bonitosLongtail tuna Longtail tuna (Thunnus tonggol) Scientific name: Thunnus tonggol Bleeker, 1851 The Longtail tuna (Thunnus tonggol) is a marine fish of the family Scombridae. Native range: Indo-West Pacific, Red Sea and East Africa to New Guinea, north to Japan, south to Australia. BiologyVertebrae: 39. A small species, deepest near the middle of the first dorsal fin base. The second dorsal fin is higher than the first dorsal fin; the pectoral fins are short to moderately long; swim bladder is absent or rudimentary. Lower sides and belly silvery white with colorless elongate oval spots arranged in horizontally oriented rows. The dorsal, pectoral and pelvic fins are blackish; the tip of the second dorsal and anal fins are washed with yellow; the anal fin is silvery; the dorsal and anal finlets are yellow with grayish margins; the caudal fin is blackish, with streaks of yellow green.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameThunnus tonggolFamilyScombridae (Mackerels, tunas, bonitos)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length145Common length70.0Depth range10 m (33 ft)EnvironmentMarine; pelagic-neritic; oceanodromous; depth range 10 - ? mClimateTropicalDistributionIndo-West Pacific: Red Sea and East Africa to New Guinea, north to Japan, south to Australia.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: highly commercial; gamefish: yesResilienceMedium, minimum population doubling time 1.4 - 4.4 years (K=0.32; assuming tm=2-4) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026