Bluefin tunas have streamlined bodies built for speed and endurance. They can even retract their dorsal and pectoral fins into slots to reduce drag.
Photograph by Brian J. Skerry
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Bluefin Tuna at Seafood Watch
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The bluefin tuna is a big fish! It can reach over three metres in length and weigh over 600 kg. Plus, it's a fast swimmer, reaching speeds of over 80 km per hour, about the speed limit on country roads.
Southern bluefin tuna, Thunnus maccoyii (Castelnau, 1872), are a very large species commonly caught by Indonesian and Japanese commercial long-liners in the Indian Ocean, their spawning ground.
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Track Atlantic bluefin tuna in the Mediterranean Sea now.
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Bluefin tuna in crisis
New measures not enough for central Pacific tuna
Promoting sustainable tuna fisheries
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Bluefin Tuna - A couple seen by participants
Mylar balloons - At least two (one retrieved by crew). :-(
Steve Mirick
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Southern bluefin tuna (Thunnus maccoyii)
Scrubwood (Commidendrum rugosum)
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He cabbage tree (Pladaroxylon leucadendron)
Saint Helena earwig (Labidura herculeana)
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I am aware of the confrontation between Japan and Australia regarding the fisheries of the bluefin tuna. The population of tuna in and around southern Australia has been known to be in decline for the past 20 years.
"Incidental capture of seabirds by Japenese southern bluefin tuna longline vessels in New Zealand waters, 1988-1992". bird conservationalist internationalbird conservationalist international (3): 181-210.
Poncet, S.; Robertson, G.; Phillips, R.
In Australia the Southern Bluefin tuna is one of two species of bluefin tunas that is kept in tuna farms by former fishermen.
" The bluefin tuna, T. thynnus, the largest of the great tunnies and the giant of bony fishes, averages 200 to 500 lb (90-225 kg) with adults sometimes reaching 14 ft (427 cm) and 3/4 tons (680 kg).
Mackerel can reach speeds in excess of 32 kph, which is necessary for survival because they are pursued by some of the fastest creatures in the sea such as porbeagle and mako sharks, porpoises, bluefin tuna, swordfish and harbour seals.
They frequently rob other seabirds of their catch and have been known to follow feeding Humpback Whales, Porbeagles and Northern Bluefin Tuna to catch fish driven to the surface by the larger animals.
 See also: Tuna, Shark, Diver, Dolphin, Herring
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