Actinopterygii (ray-finned fishes) > Perciformes
(Perch-likes) > Scombridae
(Mackerels, tunas, bonitos) > Scombrinae
Etymology: Thunnus: Greek, thynnos = tunna (Ref. 45335).
Environment / Climate / Range
Marine; pelagic-oceanic; oceanodromous (Ref. 51243); depth range 50 - 2743 m (Ref. 57178). Temperate; 5°C - 20°C (Ref. 168), preferred 16°C (Ref. 107945); 8°S - 60°S, 180°W - 180°E (Ref. 54921)
Atlantic, Indian and Pacific: temperate and cold seas, mainly between 30°S and 50°S, to nearly 60°S. During spawning, large fish migrate to tropical seas, off the west coast of Australia, up to 10°S. Highly migratory species, Annex I of the 1982 Convention on the Law of the Sea (Ref. 26139). If the current exploitation continues, the population will be below 500 mature individuals in 100 years (Ref. 27905).
Length at first maturity / Size / Weight / Age
Maturity: Lm 119.0, range 120 - 130 cm
Max length : 245 cm FL male/unsexed; (Ref. 5203); common length : 160 cm FL male/unsexed; (Ref. 9684); max. published weight: 260.0 kg (Ref. 5203); max. reported age: 20 years (Ref. 168)
Vertebrae: 39. A very large species, deepest near the middle of the first dorsal fin base. Swim bladder present. Lower sides and belly silvery white with colorless transverse lines alternating with rows of colorless dots. The first dorsal fin is yellow or bluish; the anal fin and finlets are dusky yellow edged with black; the median caudal keel is yellow in adults.
By maturity, most southern bluefin tuna lead an oceanic, pelagic existence (Ref. 6390). Spawning fish and larvae are encountered in waters with surface temperatures between 20° and 30°C. An opportunistic feeder, preying on a wide variety of fishes, crustaceans, cephalopods, salps, and other marine animals. Mostly canned (Ref. 9684). A specialized fishery for sashimi-quality has been developed recently by New Zealand fishers. In Japan, it is highly prized for the sashimi markets.
It is not known whether all mature fish spawn each year, every few years, or even only once in their lifetime (Ref. 30320).
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. 109396)
CITES (Ref. 94142)
Threat to humans
Fisheries: commercial; aquaculture: commercial; gamefish: yes
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5039 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01259 (0.01038 - 0.01526), b=3.03 (2.99 - 3.07), based on LWR estimates for this species (Ref. 93245
Trophic Level (Ref. 69278
): 3.9 ±0.53 se; Based on food items.
Resilience (Ref. 69278
): Low, minimum population doubling time 4.5 - 14 years (K=0.14-0.15; tm=8-9; tmax=20; Fec=14 million).
Prior r = 0.35, 2 SD range = 0.2 - 0.62, log(r) = -1.05, SD log(r) = 0.28, Based on: 1 M, 4 K, 3 tgen, 1 tmax, 2 Fec records
Vulnerability (Ref. 59153
): High to very high vulnerability (67 of 100) .