Atlantic Bluefin Tuna

Verified Timeline

Lore & Background

The Atlantic bluefin tuna is a member of the family Scombridae, which consists of 51 extant species in 15 genera and two subfamilies. All but one species are in the subfamily Scombrinae, which includes mackerel, tuna and bonito. Scombrids have two dorsal fins and a series of finlets behind the rear dorsal fin and anal fin. The caudal fin is strongly divided and rigid, with a slender, ridged base. The first (spiny) dorsal fin and the pelvic fins are normally retracted into body grooves. The World Wildlife Fund and the Zoological Society of London jointly issued their 'Living Blue Planet Report' on 16 September 2015 which states that a dramatic fall of 74% occurred in worldwide stocks of scombridae fish between 1970 and 2010, and the global overall 'population sizes of mammals, birds, reptiles, amphibians and fish fell by half on average in just 40 years'.

In Their Own Story

The water was a deep, cold indigo as the massive shadow cut through it with silent efficiency. A school of herring scattered in panic, their silver scales flashing like shattered glass against the dark current. The Bluefin did not tire; its red muscle fibers hummed with heat, keeping it warm in the chill of the deep. With a flick of its crescent tail, it surged forward, a torpedo of flesh and bone, closing the distance before the prey could even process the change in pressure. In that split second, the ocean's ancient order was reaffirmed: the hunter had arrived.

Reader's Guide

Ranging from the icy Labrador Sea down to West Africa and across to the Mediterranean, the Bluefin claims the Atlantic as its domain. It is a creature of extremes: feeding in cold northern currents to build mass before diving into warm southern seas to breed. To sustain their internal furnace—body temperatures running 20°F above ambient water—they must hunt constantly. Their menu favors dense schools of herring, mackerel, sardines, and squid, though crustaceans are taken when necessary. Solitary hunters by nature, they congregate only to feed or spawn. While capable of solitary dives into the crushing dark, their greatest threat remains human: listed as Endangered, illegal poaching and quota violations continue to outpace recovery efforts.

Did You Know?

• The Atlantic bluefin tuna is the largest scombrid, with a recorded length of 4.58 m (15 ft 1⁄2 in).
• It is partially endothermic (warm-blooded), a feature that helps it maintain high speed and activity.
• Scombrids like the yellowfin tuna can reach speeds of 22 km/h (12 knots).
• A dramatic fall of 74% occurred in worldwide stocks of scombridae fish between 1970 and 2010, according to the 'Living Blue Planet Report' issued on 16 September 2015.