COSEWIC Status Reports

COSEWIC Assessment and Status Report on the Atlantic Bluefin Tuna Thunnus thynnus in Canada

Atlantic Bluefin Tuna is a very large species (the all-tackle angling record is a 679 kg fish of 304 cm fork length taken off Aulds Cove, Nova Scotia in 1979), with a stout but efficiently streamlined, fusiform body that is a little compressed. There are two dorsal fins; the first is yellow or bluish while the second is reddish-brown. The head is conical with a pointed snout and a mouth that is terminal with the lower jaw slightly projecting. The dorsal surface is dark blue to black, shading to lighter blue on the sides and silvery grey below. The lower sides and belly are silvery white with colourless transverse lines alternated with rows of colourless dots (these dominate in older fish), which are visible only in fresh specimens. Atlantic Bluefin Tuna in Canadian waters are large, usually about 270 cm fork length and 400 kg or more.

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Contact Person(s)

COSEWIC Secretariat
c/o Canadian Wildlife Service
Environment Canada
Ottawa, ON
K1A 0H3
Tel: 819-938-4125
Fax: 819-938-3984
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