Long-tailed tuna
| Long-tailed tuna | ||||||||||||
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Long-tailed tuna ( Thunnus tonggol ) |
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| Thunnus tonggol | ||||||||||||
| ( Bleeker , 1851) |
The long-tailed tuna ( Thunnus tonggol ) is a relatively small species of tuna that is found in the Indo-Pacific especially near the coasts of the Arabian Peninsula , India , Southeast Asia and Australia .
features
The long-tailed tuna is a relatively small species of tuna. It grows to a maximum of 130 cm in length, with average lengths usually in the range of 40 and 70 centimeters. The largest long-tailed tuna caught so far was 136 centimeters long and weighed 35.9 kilograms; He came from the area around Montagne Island , New South Wales . The color of the back and the upper flanks is gray-blue, the ventral side and the lower flank parts are silvery white with long oval spots. The dorsal, pectoral and pelvic fins are black, the tips of the first dorsal fin and the anal fin are lightened yellow. and the anal fin itself is silver. The finlets are yellow with a gray border, the caudal fin is black with yellow-green stripes.
The fish reaches its greatest height approximately in the middle of the first dorsal fin . The second dorsal fin is significantly higher than the first. The pectoral fins are elongated and amount to 22% (in adult animals) to 31% of the total length. It is named after the long and narrow tail stem, which, like all tuna, is equipped with small fins (finlets).
distribution and habitat
The distribution area of the long-tailed tuna is in the Indo-Pacific, especially near the coasts of the Arabian Peninsula , India and Southeast Asia with the Philippines and Papua New Guinea and along the coast of Australia with the exception of the south coast. In the area of the Arabian Peninsula, the tuna invades the southern Red Sea and can accordingly also be found on the Somali coast .
The long-tailed tuna is a fish that lives mainly in the shallow water of the shelf area near the coast . It avoids strong currents and areas with lower salinity , such as the estuaries of larger rivers.
Way of life
Like all tuna, the long-tailed tuna is an opportunistic hunter and feeds on a wide range of smaller schooling fish, crustaceans and cuttlefish. Due to their size, they are only hunted by a few predatory fish, especially sharks and toothed whales are possible predators. He can form groups of different sizes.
use
Long-tailed tuna are fished with both nets and longlines. The main catching nations are Japan , the Philippines , Australia , Papua New Guinea , Indonesia , India and the United Arab Emirates .
literature
- Bruce B. Collette, Cornelia E. Nauen: Scombrids of the world. An annotated and illustrated catalog of tunas, mackerels, bonitos and related species known to date (= FAO Species Catalog. Vol. 2 = FAO Fisheries Synopsis. No. 125, Vol. 2). United Nations Development Program et al., Rome 1983, ISBN 92-5-101381-0 , pp. 92-93, ( complete edition ).
Web links
- Long-tailed tuna on Fishbase.org (English)
- Thunnus tonggol inthe IUCN 2013 Red List of Threatened Species . Posted by: Collette, B., Di Natale, A., Fox, W., Juan Jorda, M., Miyabe, N., Nelson, R., Sun, C. & Uozumi, Y., 2009 . February 2014.