Scombridae

southern bluefin tuna

Thunnus maccoyii

Maintaining body heat in cold water

• Blue
• Yellow
• Cross-climate
• Temperate
• Tropical
• Regional distribution
• Marine fish
• Atlantic Ocean
• Indian Ocean
• Pacific Ocean
• Oceania
• Fusiform
• Large
• Temperate fish

The southern bluefin tuna (Thunnus maccoyii) is a tuna of the family Scombridae found in open southern Hemisphere waters of all the world's oceans mainly between 30°S and 50°S, to nearly 60°S. At up to 2.5 metres (8 ft 2 in) and weighing up to 260 kilograms (570 lb), it is among the larger bony fishes. Southern bluefin tuna, like other pelagic tuna species, are part of a group of bony fishes that can maintain their body core temperature up to 10 °C (18 °F) above the ambient temperature. This advantage enables them to maintain high metabolic output for predation and migrating large distances.