Thunnus


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Related to Thunnus: Thunnus albacares, Physeter
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Thunnus

 

a genus of fishes of the family Scombridae. A number of ichthyologists distinguish Thunnidae as a separate family with several genera. The body is elongated and spindle-shaped. The tapering tail has large leathery ridges on all sides. Behind the dorsal and anal fins are several finlets. Members of the genus are distinguished from other fishes by the high development of the cutaneous blood vessels, the lateral muscles of the body, and the dark muscles close to the spine; these adaptations allow the fish to swim rapidly for long periods.

The genus embraces seven species, distributed in tropical and subtropical waters of the Atlantic, Pacific, and Indian oceans. In the USSR an Atlantic subspecies of the bluefin tuna (Thunnus thynnus atlanticus) is encountered in the Black Sea, the Sea of Azov, and occasionally the Barents Sea; it attains a length of 3 m and a weight of 600 kg. An Indo-Pacific subspecies of the bluefin (T. t. orientalis) and, on occasion, the albacore (T. alalunga) are encountered in the Sea of Japan.

Tuna are thermophilic, pelagic school fish that migrate long distances. They feed on small fish, cephalopod mollusks, and pelagic crustaceans. They have great commercial value. Representatives of other genera of the family Scombridae are called little tunnies.

REFERENCES

Nikol’skii, G. V. Chastnaia ikhtiologiia, 3rd ed. Moscow, 1971.
Zhizn’ zhivotnykh, vol. 4, part 1. Moscow, 1971.

Z. V. KRASIUKOVA

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Complex migration routes of Atlantic bluefin tuna (Thunnus thynnus) question current population structure paradigm.
Seasonal epizootics of sea lice, Caligus spp., on southern bluefin tuna, Thunnus maccoyii (Castelnau), in a long-term farming trial.
Soltanizadeh, "Effect of high voltage electrostatic field thawing on the lipid oxidation of frozen tuna fish (Thunnus albacares)," Innovative Food Science and Emerging Technologies, vol.
Bioaccumulation of mercury in muscle tissue of yellowfin tuna, Thunnus albacares of the eastern Pacific Ocean.
Growth of yellowfin tuna (Thunnus albacares) in the equatorial western Pacific Ocean.
Extraction optimization and properties of collagen from yellowfin tuna (Thunnus albacares) dorsal skin.
In addition, catching of tuna and tuna-like (Auxis rochei, Auxis thazard, Euthynnus affinis, Katsuwonus palamis, Rastrelliger kanagurta, Scomber japonicas, Scomberomorus commerson, Scomberomorus guttatus, Thunnus albacares and Thunnus tonggol) species is a major component in large pelagic fisheries in Iran [2,3].
California's HMS fisheries have generally declined from their peak in the 1960's, when the tuna purse seine fishery targeting Pacific bluefin tuna, Thunnus orientalis, was one of the largest tuna fisheries (Calkins, 1982).
Quantification of ovarian follicles in bluefin tuna Thunnus thynnus by two stereological methods.
"In accordance with recent Mexican government regulation revisions, the capture of bluefin tuna (Thunnus orientalis) in Mexican waters is forbidden for the remainder of the 2014 calendar year.