Ceduna is also a hub for research on southern bluefin tuna. Several fishing competitions targeting southern bluefin tuna are held annually. Yellowfin is becoming a popular replacement for the severely depleted supplies of southern bluefin tuna. These upwellings support lucrative fisheries, including that of the southern bluefin tuna and sardine. The oxygen need and oxygen uptake of the southern bluefin tuna are directly related. It is commonly known as the longtail tuna or northern bluefin tuna. The body of the Atlantic bluefin tuna is rhomboidal in profile and robust. Heat exchange in southern bluefin tuna is a unique adaption among teleost fishes. Atlantic bluefin tuna spawn in two widely separated areas. Tuna meat is driving overfishing as to endanger some species like the bluefin tuna. This regulation of an internal ion concentration classifies southern bluefin tuna as osmoregulators. Pacific bluefin tuna support a large commercial fishery. Tunny was the name used in Britain at that time for Atlantic bluefin tuna. RoboTuna is designed to swim and to resemble a bluefin tuna. Atlantic bluefin tuna reach maturity relatively quickly.