Thunnus obesus, Bigeye tuna : fisheries, gamefish

Thunnus obesus (Lowe 1839)

Bigeye tuna
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Thunnus obesus   AquaMaps   Data sources: GBIF OBIS
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Thunnus obesus
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Classificação / Names Nomes comuns | Sinónimos | Catalog of Fishes (gen., sp.) | 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 Ecologia

; marinhas; oceanódromo (Ref. 51243); intervalo de profundidade 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

Distribuição Países | Áreas FAO | Ecossistemas | Ocorrências | Point map | Introduções | Faunafri

Atlantic, Indian and Pacific: in tropical and subtropical waters. Absent in the Mediterranean. Highly migratory species, Annex I of the 1982 Convention on the Law of the Sea (Ref. 26139).

Length at first maturity / Tamanho / Peso / Idade

Maturity: Lm ?, range 100 - 125 cm
Max length : 250 cm TL macho/indeterminado; (Ref. 27000); common length : 180 cm FL macho/indeterminado; (Ref. 168); peso máx. Publicado: 210.0 kg (Ref. 9987); Idade máx. registada: 11 anos (Ref. 30326)

Descrição breve Morfologia | Morfometria

Espinhos dorsais (total): 13 - 14; Raios dorsais moles (total): 14-15; Espinhos anais 0; Raios anais moles: 14; Vértebras: 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).

Biologia     Glossário (ex. 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 Maturidade | Reprodução | Desova | Ovos | Fecundidade | Larvas

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).

Referência principal Upload your references | Referências | Coordenador : 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)

Categoria na Lista Vermelha da IUCN (Ref. 123251)

  Vulnerável, ver o Livro Vermelho da IUCN (VU) (A2bd); Date assessed: 18 February 2011

CITES (Ref. 123416)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Ameaça para o homem

  Harmless





Utilização humana

Pescarias: altamente comercial; peixe desportivo: sim
FAO(pescarias: produção, perfil da espécie; publication : search) | FIRMS (Stock assessments) | FishSource | Sea Around Us

Ferramentas

Relatórios especiais

Descarregue XML

Fontes da internet

Estimates based on models

Preferred temperature (Ref. 115969): 16.8 - 28.6, mean 26.6 °C (based on 3638 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5039   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01413 (0.01098 - 0.01817), b=3.02 (2.98 - 3.06), in cm total length, based on LWR estimates for this species (Ref. 93245).
Nível Trófico (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.
Resiliência (Ref. 120179):  Médio, tempo mínimo de duplicação da população 1,4 - 4,4 anos (K=0.11-0.23; tm=3; tmax=11; Fec=2 million).
Prior r = 0.65, 95% CL = 0.43 - 0.98, Based on 5 stock assessments.
Vulnerabilidade (Ref. 59153):  High vulnerability (56 of 100) .
Categoria de preço (Ref. 80766):   Very high.