Tuna can swim up to 230 kilometers per day.

The tuna family (scientific name: Thunnini): a group of marine fishes under the order Scleractinia, order Scombroid, family Scombridae. The family contains 5 genera and 15 species of tuna, the size of each species varies greatly, the smallest tuna is the round rudder skipjack tuna, whose maximum length is 50 cm and weight is 1.8 kg; the largest tuna is the Atlantic bluefin tuna, whose maximum length is 4.6 meters and weight is 684 kg.

The average length is 2 meters and it is believed that it can live up to 50 years. The tuna is tapered at both ends and has a moderate mouth with well-developed teeth. The gill membranes are not attached to the pharyngeal isthmus. The scales are pendulum-shaped and usually small, and the body color is metallic, usually blue and silver. Tuna have dark bands and fins. The dorsal fin consists of 9 to 27 densely arranged fins, and the ventral fin has 6 fins.

Tuna are species that can maintain their body temperature at a higher temperature than the surrounding water. They are some of the most active and agile predators with smooth, streamlined bodies and are among the fastest swimming pelagic fish. Tuna can be found in warmer waters, making it a heavily commercially fished fish and a popular fish among fishing activities.

Some tuna species, such as the bluefin tuna, are close to extinction due to overfishing by humans. Tuna are found in tropical and subtropical waters around the world, with many species making regular forays into cooler temperate waters. In the late 1800s and at the turn of the century, the main fish people bought and ate from cans was sardines. One of the major areas of sardine fishing was Southern California in the United States, especially San Diego.

In 1903, the sardine fishery was in extremely bad shape due to the ****ed up effects of overfishing and poor ocean conditions. A canning businessman - Albert P. Halfhil, - saw so many empty sardine cans in San Pedro Bay that he came up with a way to fill them.

He experimented by packing empty sardine cans with locally caught albacore tuna. Albacore tuna are highly migratory species that migrate to the West Coast every year. They are readily available and provide a single fish to fill an empty sardine can. Halffel sold 700 cases in his first year of business, and by 1914 his company was producing 400,000 cases a year.