What is Tuna?
{{Automatic taxobox | name = Tuna | image = tuna_assortment.png | image_width = 250px | image_caption = Tunas (from top): [[albacore]], [[Atlantic bluefin tuna|Atlantic bluefin]], [[Skipjack tuna|skipjack]], [[Yellowfin tuna|yellowfin]], [[Bigeye tuna|bigeye]] | taxon = Thunnini | authority = Starks, 1910 | subdivision_ranks = Genera | subdivision = * ''[[Allothunnus]]:'' slender tunas * ''[[Auxis]]:'' frigate tunas * ''[[Euthynnus]]:'' little tunas * ''[[Katsuwonus]]:'' cocinal tunas * ''[[Thunnus]]:'' albacores, true tunas }} '''Tuna''', sometimes called '''tuna fish''', are several [[species]] (kinds) of [[fish]]. They are in the family '''[[Scombridae]]''', mostly in the genus '''''Thunnus'''''. Tuna are fast swimmers. People have seen tuna swim at up to 77&nbsp;km/h. Several species of tuna are [[warm-blooded]]. Most species of fish have white flesh. The flesh of the tuna is different. It is pink to dark red. This is because tuna muscle [[Tissue (biological)|tissue]] contains greater quantities of [[myoglobin]]. Myoglobin is a [[molecule]] that binds [[oxygen]]. Some of the larger tuna species such as the [[Northern bluefin tuna]] can raise their blood temperature above the water temperature with muscular activity. This enables them to live in cooler waters and survive a wider range of circumstances. == History == Tuna fishing plays a vital role in the economy, food security, and culture of many coastal communities worldwide. Looking at the history of the art of tuna fishing, it is important to know where the origins of this practice come from. The organized exploitation of tuna began when somebody invented the tuna traps and fish factories linked to them. In the Mediterranean Sea, and the Atlantic Sea, it is to our knowledge that the Phoenicians were the ones who started this industrial activity. The Greeks, in the Black Sea and the Aegean Sea, followed the Phoenician lead. Eventually, tuna fishing spread to the Atlantic Spanish areas close to Gibraltar. One of the more convincing factors that makes us