Djibouti country information

Common names: Bigeye tuna, Thon obèse
Occurrence: native
Salinity: marine
Abundance: occasional (usually not seen) | Ref: Bouhlel, M., 1988
Importance: minor commercial | Ref: Bouhlel, M., 1988
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Not common in Tadjourah gulf (Ref. 5450).
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/dj.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: Bouhlel, M., 1988
National Database:

Common names from other countries

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

Classificatie / Names Lokale namen | Synoniemen | Catalog of Fishes(Genus, Soort(en)) | 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 Ecologie

marien; oceanodroom (Ref. 51243); diepte 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

Verspreiding Landen | FAO regio's | Ecosystemen | Voorkomen | Point map | Introducties | Faunafri

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

Lengte bij maturiteit / Grootte / Gewicht / Leeftijd

Maturity: L_m 112.5, range 100 - 125 cm
Max length : 250 cm TL mannelijk / geslacht onbekend; (Ref. 27000); common length : 180 cm FL mannelijk / geslacht onbekend; (Ref. 168); max. gepubliceerd gewicht: 210.0 kg (Ref. 9987); max. gerapporteerde leeftijd: 11 Jaren (Ref. 30326)

Korte beschrijving Determinatiesleutels | Morfologie | Morfometrie

Dorsale stekels (totaal) : 13 - 14; Dorsale zachte stralen (totaal) : 14 - 15; Anale stekels: 0; Anale zachte stralen: 14; Wervels: 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).

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).

Levenscyclus en paargedrag Maturities | Voortplanting | Spawnings | Egg(s) | Fecundities | 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).

Hoofdreferentie Upload your references | Referenties | Coördinator : Collette, Bruce B. | Medewerkers

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)

Status op de Rode Lijst van het IUCN (Ref. 130435)

Kwetsbaar, zie IUCN Rode Lijst (VU) (A2bd); Date assessed: 15 January 2021

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaar voor de mens

Harmless

Gebruik door de mens

Visserij: van groot commercieel belang; sportvis: ja

FAO(visserij: productie, soortsprofiel; publication : search) | FIRMS (Stock assessments) | FishSource | Sea Around Us

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Estimates based on models

Preferred temperature (Ref. 115969): 16.8 - 28.6, mean 26.6 (based on 3638 cells).

Fylogenetische diversiteitsindex (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).

Trofisch niveau (Ref. 69278): 4.5 ±0.0 se; based on diet studies.

Weerstandsvermogen (Ref. 120179): Gemiddeld, minimale populatieverdubbelingstijd 1,4-4,4 jaar (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).

Prijsklasse (Ref. 80766): Very high.

Thunnus obesus (Lowe, 1839)