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Thunnus obesus (Lowe, 1839)

Bigeye tuna
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Native range | All suitable habitat | Point map | Year 2050
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Thunnus obesus   AquaMaps   Data sources: GBIF OBIS
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Image of Thunnus obesus (Bigeye tuna)
Thunnus obesus
Picture by Chow, S.


Kenya country information

Common names: [No common name]
Occurrence: native
Salinity: marine
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Also Ref. 12484.
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/ke.html
National Fisheries Authority: http://www.recoscix.org/openscrn.htm
Occurrences: Occurrences Point map
Main Ref: Collette, B.B. and C.E. Nauen, 1983
National Database:

Common names from other countries

Classification / Names Nombres comunes | Sinónimos | Catalog of Fishes(Género, Especie) | ITIS | CoL | WoRMS | Cloffa

> Scombriformes (Mackerels) > Scombridae (Mackerels, tunas, bonitos) > Scombrinae
Etymology: Thunnus: Greek, thynnos = tunna (Ref. 45335).
  More on author: Lowe.

Environment: milieu / climate zone / depth range / distribution range Ecología

marino; oceanodromo (Ref. 51243); rango de profundidad 0 - 1500 m (Ref. 117020), usually 0 - 500 m (Ref. 117020).   Subtropical; 13°C - 29°C (Ref. 168); 52°N - 48°S, 180°W - 180°E

Distribución Países | Áreas FAO | Ecosistemas | Ocurrencias, apariciones | Point map | Introducciones | Faunafri

Atlantic, Indian and Pacific: in tropical and subtropical waters. Absent in the Mediterranean. Highly migratory species.

Length at first maturity / Tamaño / Peso / Age

Maturity: Lm 112.5, range 100 - 125 cm
Max length : 250 cm TL macho / no sexado; (Ref. 27000); common length : 180 cm FL macho / no sexado; (Ref. 168); peso máximo publicado: 210.0 kg (Ref. 9987); edad máxima reportada: 11 años (Ref. 30326)

Short description Claves de identificación | Morfología | Morfometría

Espinas dorsales (total) : 13 - 14; Radios blandos dorsales (total) : 14 - 15; Espinas anales: 0; Radios blandos anales: 14; Vértebra: 39. This large species is distinguished by the following characters: robust, fusiform body, slightly compressed from side to side; total gill rakers on first gill arch 23-31; dorsal fins separated only by a narrow interspace, the second followed by 8-10 finlets; anal fin followed by 7-10 finlets; pectoral fins moderately long (22 to 31% of fork length) in large specimens (over 110 cm FL), but very long (as long as in Thunnus alalunga) in smaller specimens; 2 flaps (interpelvic process) between pelvic fins; very small scales on body; corselet of larger and thicker scales developed, but not very distinct; caudal peduncle very slender, with a strong lateral keel between 2 smaller keels; ventral surface of liver striated; swimbladder present. Colour of back metallic dark blue, lower sides and belly whitish; a lateral iridescent blue band runs along sides in live specimens; first dorsal fin deep yellow, second dorsal and anal fins light yellow, finlets bright yellow edged with black (Ref. 9684).

Biología     Glosario (por ej. epibenthic)

Occur in areas where water temperatures range from 13°-29°C, but the optimum is between 17° and 22°C. Variation in occurrence is closely related to seasonal and climatic changes in surface temperature and thermocline. Juveniles and small adults school at the surface in mono-species groups or mixed with other tunas, may be associated with floating objects. Adults stay in deeper waters (Ref. 5377). Eggs and larvae are pelagic (Ref. 6390). Feed on a wide variety of fishes, cephalopods and crustaceans during the day and at night (Ref. 9340). Meat is highly prized and processed into sashimi in Japan. Marketed mainly canned or frozen (Ref. 9684), but also sold fresh (Ref. 9340).

Life cycle and mating behavior Maturities | Reproducción | Spawnings | Egg(s) | Fecundities | Larva

Are multiple spawners that may spawn every 1 or 2 days over several months (Ref. 30330). They spawn over periods of the full moon (Ref. 6390). Spawn throughout the year in tropical waters (Ref. 6390).

Main reference Upload your references | Referencias | Coordinador : Collette, Bruce B. | Colaboradores

Collette, B.B. and C.E. Nauen, 1983. FAO Species Catalogue. Vol. 2. Scombrids of the world. An annotated and illustrated catalogue of tunas, mackerels, bonitos and related species known to date. Rome: FAO. FAO Fish. Synop. 125(2):137 p. (Ref. 168)

IUCN Red List Status (Ref. 130435)

  Vulnerable, ver lista roja de la UICN (VU) (A2bd); Date assessed: 15 January 2021

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless




Human uses

Pesquerías: muy comercial; pesca deportiva: si
FAO(pesquerías: producción, species profile; publication : search) | FIRMS (Stock assessments) | FishSource | Sea Around Us

Más información

Trophic ecology
componentes alimenticios
Diet compositions
Food consumptions
Food rations
Despredadores
Ecology
Ecología
Home ranges
Life cycle
Reproducción
Maturities
Fecundities
Spawnings
Spawning aggregations
Egg(s)
Egg developments
Larva
Dinámica larvaria
Anatomy
Gill areas
Cerebros
Otolitos
Physiology
Body compositions
Nutrients
Oxygen consumptions
Tipo de natación
Swimming speeds
Visual pigment(s)
Sonidos de peces
Diseases / Parasites
Toxicities (LC50s)
Genetics
Genética
Electrophoreses
Heritabilities
Human related
Aquaculture systems
Perfiles de acuicultura
Razas
Ciguatera cases
Stamps, coins, misc.
Outreach
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References
Referencias

Herramientas

Special reports

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Fuentes de Internet

Estimates based on models

Preferred temperature (Ref. 115969): 16.8 - 28.6, mean 26.6 (based on 3638 cells).
Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5039   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01318 (0.01039 - 0.01673), b=3.03 (2.99 - 3.07), in cm Total Length, based on LWR estimates for this species (Ref. 93245).
Nivel trófico (Ref. 69278):  4.5   ±0.0 se; based on diet studies.
Resiliencia (Ref. 120179):  Medio, población duplicada en un tiempo mínimo de 1.4-4.4 años (K=0.11-0.23; tm=3; tmax=11; Fec=2 million).
Prior r = 0.52, 95% CL = 0.34 - 0.77, Based on 10 full stock assessments.
Fishing Vulnerability (Ref. 59153):  High vulnerability (56 of 100).
Climate Vulnerability (Ref. 125649):  Moderate to high vulnerability (47 of 100).
Price category (Ref. 80766):   Very high.