ENDANGERED: Southern Bluefin Tuna (Thunnus maccoyii)

ADS Social ASX
3 min readFeb 24, 2023


Day #19

Physical characteristics: Southern Bluefin Tuna (Thunnus maccoyii) are large, streamlined fish that can reach up to 2.5 meters in length and weigh up to 260 kg. They have dark blue-black backs, silver sides, and white undersides. Southern Bluefin Tuna have a unique biological trait known as endothermy, which means they can maintain their body temperature higher than the surrounding water, enabling them to swim at high speeds and inhabit cooler waters.

Distribution: Southern Bluefin Tuna are found in the southern hemisphere, predominantly in the temperate waters of the Indian and South Atlantic Oceans. They are a migratory species, moving between spawning grounds in the Indian Ocean and feeding grounds in the South Atlantic.


Fisheries: Southern Bluefin Tuna is a highly prized commercial species, and as a result, has been heavily overfished. The population of Southern Bluefin Tuna declined rapidly from the 1960s to the 1990s due to overfishing, and the species is now listed as Critically Endangered by the International Union for Conservation of Nature (IUCN). The Southern Bluefin Tuna fishery is now managed by the Commission for the Conservation of Southern Bluefin Tuna (CCSBT), which regulates fishing quotas and other measures to protect the species.

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Conservation efforts: The CCSBT has implemented measures to reduce overfishing of Southern Bluefin Tuna, including setting quotas for fishing, implementing catch limits, and enforcing measures to reduce illegal, unreported, and unregulated fishing. Other conservation efforts include research on Southern Bluefin Tuna biology and population dynamics, monitoring of fishing activities, and programs to educate the public about the importance of sustainable fishing practices.


In conclusion, Southern Bluefin Tuna is an important and endangered species that has been heavily overfished due to its high commercial value. However, conservation efforts are underway to protect the species and ensure its long-term survival. It is essential to promote sustainable fishing practices to reduce the impact on this species and help to maintain healthy populations of Southern Bluefin Tuna in the future.

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