Atlantic Bluefin Tuna

Identification

The Atlantic bluefin tuna is one of the largest bony fish in the world: up to 3 meters and over 600 kg. The body is torpedo-shaped and perfectly streamlined. Dark blue on back, silvery flanks. A series of small finlets behind the second dorsal and anal fins. The crescent-shaped tail fin indicates a fast swimmer.

Behavior & ecology

A warm-blooded predator that can maintain body temperature above surrounding water, enabling hunting in cold waters. Swims at speeds up to 70 km/h. Hunts herring, mackerel, sardines, and squid. Migrates enormous distances: from the Mediterranean (spawning) to Norway and even the Gulf of Mexico.

In the Netherlands

After decades of absence, the bluefin tuna is returning to the North Sea. This is partly due to improved fisheries management and partly warmer waters. In the 1930s-1950s, tuna was actively fished in the North Sea from Denmark and Norway. The species is now strictly protected under ICCAT quotas.