Thunnus obesus, Bigeye tuna : fisheries, gamefish

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Thunnus obesus (Lowe, 1839)

Bigeye tuna
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Native range | All suitable habitat | Point map | Year 2050
This map was computer-generated and has not yet been reviewed.
Thunnus obesus   AquaMaps   Data sources: GBIF OBIS
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Image of Thunnus obesus (Bigeye tuna)
Thunnus obesus
Photo von Chow, S.

Liberia territory information

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

Common names from other countries

Thon obèse, Patudo, Тунец большеглазый, ... more

Klassifizierung / Names Namen | Synonyme | Catalog of Fishes(Gattung, Arten) | ITIS | CoL | WoRMS | Cloffa

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

Umwelt: Milieu / Klimazone / Tiefenbereich / Verbreitungsgebiet Ökologie

seewasser pelagic-oceanic; ozeanodrom (Ref. 71039); tiefenbereich 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

Verbreitung Territorien | FAO Gebiete | Ökosysteme | Vorkommen | Punkt Karte | Einführungen | Faunafri

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

Länge bei der ersten Reifung / Größe / Gewicht / Alter

Geschlechtsreife: Lm 112.5, range 100 - 125 cm
Max length : 250 cm TL Männchen/unbestimmt; (Ref. 27000); common length : 180 cm FL Männchen/unbestimmt; (Ref. 168); max. veröff. Gewicht: 210.0 kg (Ref. 9987); max. veröff. Alter: 17 Jahre (Ref. 137697)

Kurzbeschreibung Bestimmungsschlüssel | Morphologie | Morphometrie

Rückenflossenstacheln (insgesamt) : 13 - 14; Rückenflossenweichstrahlen (insgesamt) : 14 - 15; Afterflossenstacheln: 0; Afterflossenweichstrahlen: 14; Wirbelzahl: 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).
Body shape (shape guide): fusiform / normal; Cross section: oval.

Biologie     Fachlexikon (Englisch) (z.B. 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).

Lebenszyklus und Paarungsverhalten Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fruchtbarkeit | Larven

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).

Hauptreferenz Laden Sie Ihre Referenzen hoch | Referenzen | Koordinator : Collette, Bruce B. | Partner

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 Rote Liste Status (Ref. 130435: Version 2025-2)

  Verwundbar (VU) (A2bd); Date assessed: 15 January 2021

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Bedrohung für Menschen

  Harmless





Nutzung durch Menschen

Fischereien: hoch kommerziell; Sportfisch: ja
FAO - Fischereien: landungen, Artbeschreibung; Publication: search | FIRMS - Stock assessments | FishSource | Das Meer um uns herum

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Schätzungen auf der Grundlage von Modellen

Bevorzugte Temperatur (Ref. 123201): 16.8 - 28.6, mean 26.6 °C (based on 3638 cells).
Phylogenetischer Diversitätsindex (Ref. 82804):  PD50 = 0.5039   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01318 (0.01043 - 0.01666), b=3.03 (2.99 - 3.07), in cm total length, based on LWR estimates for this species (Ref. 93245).
Trophische Ebene (Ref. 69278):  4.5   ±0.0 se; based on diet studies.
Generation time: 6.6 (4.4 - 10.4) years. Estimated as median ln(3)/K based on 12 growth studies.
Widerstandsfähigkeit (Ref. 120179):  mittel, Verdopplung der Population dauert 1,4 - 4,4 Jahre. (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.
Anfälligkeit der Fischerei (Ref. 59153):  High vulnerability (56 of 100). 🛈
Klimaanfälligkeit (Ref. 125649):  Moderate to high vulnerability (47 of 100). 🛈
Preiskategorie (Ref. 80766):   Very high.
Nährstoffe (Ref. 124155):  Calcium = 22.1 [12.0, 42.2] mg/100g; Iron = 2.65 [1.06, 6.93] mg/100g; Protein = 24 [23, 25] %; Omega3 = 0.453 [0.273, 0.754] g/100g; Selenium = 54.7 [17.4, 171.5] μg/100g; VitaminA = 19.6 [2.7, 180.1] μg/100g; Zinc = 0.278 [0.153, 0.561] mg/100g (wet weight);