Thunnus obesus, Bigeye tuna : fisheries, gamefish
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Thunnus obesus (Lowe 1839)

Bigeye tuna
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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.

Классификация / Names народные названия | синонимы | 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 экология

; морской; мигрирует в океане (Ref. 51243); пределы глубины 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

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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 / Size / Вес / Возраст

Maturity: Lm ?, range 100 - 125 cm
Max length : 250 cm TL самец/пол неопределен; (Ref. 27000); common length : 180 cm FL самец/пол неопределен; (Ref. 168); наибольший вес (опубликованные данные): 210.0 kg (Ref. 9987); наибольший возраст (опубликованны данные): 11 годы (Ref. 30326)

Краткое описание морфология | морфометрия

колючие лучи спинного плавника (общее число): 13 - 14; членистые (мягкие) лучи спинного плавника (общее число): 14-15; колючие лучи анального плавника 0; членистые (мягкие) лучи анального плавника: 14; позвонки: 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).

биология     глоссарий (например 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 половая зрелость | размножение | нерест | икра | Fecundity | личинки

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).

Основная ссылка Upload your references | ссылки | координатор : Collette, Bruce B. | соавторы

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)

Статус Красного Списка МСОП (Ref. 123251)

  уязвимый; см. Красный Список МСОП (VU) (A2bd); Date assessed: 18 February 2011

CITES (Ref. 123416)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Угроза для людей

  Harmless





Использование человеком

рыболовство: важный объект промысла; объект спортивного рыболовства: да
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дополнительная информация

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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).
Trophic level (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.
устойчивость к внешним воздействиям (Ref. 120179):  средний (среднего размера), минимальное время удвоения популяции 1.4-4.4 года (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.
Уязвимость (Ref. 59153):  High vulnerability (56 of 100) .
Категория цены (Ref. 80766):   Very high.