Thunnus is a genus of ocean-dwelling fish in the family Scombridae, all of which are tuna, although other tuna species are found in other genera. The name of the genus is the Latinized form of the Greek θύννος, thýnnos, tuna, the word being first mentioned in Homer. Due to overfishing the genus range has been significantly reduced, being effectively removed from the Caspian Sea, for example.
Their coloring metallic blue on top and shimmering silver-white on the bottom helps camouflage them from above and below.
They can grow to 15 feet long and weigh over 1,000 pounds. They can swim up to 50 miles per hour when pursuing prey.
There are eight species:
Albacore, Thunnus alalunga (Bonnaterre, 1788).
Bigeye tuna, Thunnus obesus (Lowe, 1839).
Blackfin tuna, Thunnus atlanticus (Lesson, 1831).
Pacific bluefin tuna, Thunnus orientalis (Temminck & Schlegel, 1844).
Northern bluefin tuna, Thunnus thynnus (Linnaeus, 1758).
Southern bluefin tuna, Thunnus maccoyii (Castelnau, 1872).
Longtail tuna, Thunnus tonggol (Bleeker, 1851).
Yellowfin tuna, Thunnus albacares (Bonnaterre, 1788
Atlantic bluefins are warm-blooded, which is a rare trait among fish, and are comfortable in the cold waters. Bluefin fish are found in Newfoundland and Iceland, as well as the tropical waters of the Gulf of Mexico and the Mediterranean Sea, where they go each year to spawn Their coloring metallic blue on top and shimmering silver-white on the bottom helps camouflage them from above and below.
Species of several other genera (all in the family Scombridae) also have common names containing tuna
bluefin tuna big fish