Ernest Hemingway thrilled to the tuna: to their size, and their strength. They are big as a grizzly bear, and he loved them for it. Most reach around 1.8 metres, but the largest outliers of the largest species, the Atlantic bluefin, can be twice that, and more than six hundred kilograms. In 1922, watching a school of tuna hunt a run of sardines from the Spanish port of Vigo, Hemingway wrote in a n