Thunnus


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Related to Thunnus: Thunnus albacares, Physeter

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

References in periodicals archive ?
Synopsis of Biological Data on Kuromaguro Thunnus orientalis (Temminck and Schlegel) 1942 (Pacific Ocean).
0% para la cabrilla, Mycteroperca xenarcha y el atun, Thunnus thynnus hasta 14.
Tuna Mata Besar Bigeye tuna Thunnus abesus 10,544 2.
Biologists note one species of albacore, or Thunnus alalunga in the Pacific but two major populations, separated, approximately, by the equator.
Composition y analisis de la dieta del atun aleta amarilla Thunnus albacares en el Oceano Patifico mexicano durante el periodo 1984-1985.
In another example, significant differences in average oocyte size were observed along the anterior-posterior axis and between the center and periphery of ovary lobes in bigeye tuna Parathunnus sibi (= Thunnus obesus: Lowe, 1839) (Yuen, 1955) and bluefin tuna Thunnus thynnus (Linnaeus, 1758) (Baglin, 1982).
Metal concentrations were determined in edible portion (muscle) of fish (Pangasius hypophthalamus Sardina pilchardus Thunnus alalunga) and shrimp (Penaeus vannamei) samples.
Using hook depth as a tool to selectively target pelagic species has been used extensively in commercial fisheries for decades, with most of the effort focused on bigeye tuna, Thunnus obesus, and albacore, Thunnus alalunga, (Suzuki et ah, 1977; Sakagawa et ah, 1987).
One offshore fish that tends to show up in late April and hang around through the end of May is Thunnus atlanticus, better known as blackfin tuna to fishermen here in South Florida.
Concentrations of 24 elements in bluefin tuna, Thunnus thynnus from the northwest Atlantic.