I like this promotional Big Century Tuna. We saw this during one of the fun runs in the city.
Tuna is canned in edible vegetable oils, in brine, in water, or in various sauces. In the United States, canned tuna is sometimes called tuna fish and only albacore can legally be sold in canned form as "white meat tuna"; in other countries, yellowfin is also acceptable. While in the early 1980s, canned tuna in Australia was most likely southern bluefin; as of 2003 it was usually yellowfin, skipjack, or tongol (labelled "northern bluefin")
Source: Wikipedia