​​The Consrtvation Status is always according to the newes assessment by the IUCN (IUCN Redlist)

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Southern Bluefin Tuna (Thunnus maccoyii)

Conservation Category:

Critically endangered, trend decreasing

Threats:

​​Overfishing (within 30 years depleted to 7-15% of 1950' stock)

​​​​​​Did you know?

Bluefin Tuna is the most expensive fish on the world

Learn more about Polar Bears:

​On IUCN

On Wikipedia

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Source: http://bioweb.uwlax.edu/bio203/s2009/schwobe_dust/tuna_distribution_92419.gif

Figure: Distribution of Bluefin Tuna

Overfishing:

Within the last century, the fishing practices have changed drastically. More and more technical equipment helps finding schools of fish, and industrial fisheries use trawler, long lines, explosives and other effective fishing methods. However, on the contrary to the believes of the people over a century ago, the resources are not unlimited; fish stocks are depleted to unacceptable levels. The fishing communities rely on the harvest and so they keep on taking more and more out of the sea; not realizing that by wanting more and more, they get less and less. Fishes are getting less and smaller. About 80 % of all newborn fish are later caught for food. Fishermen fish deeper and deeper down the food web.

Source: Millennium Ecosystem Assessment

Figure: The global Fish Catches have been decreasing again. One could almost talk of the "peak fish"

Source: Millennium Ecosystem Assessment

Figure: Fish are caught deeper and depper down with new technologies

Source: D. Pauly et al. (1998), Fishing down marine food webs, Science 279:860-863

Figure: The Fishing Companies have overused the large fish and so they have to fish down the food web