Tuna is a nutritious and valuable fish; it is very popular in Japan, some European and American countries, and it can be said that tuna is a household name in these countries, just like the Chinese people are familiar with large yellow croaker, small yellow croaker and hairtail. In some European and American countries, people compare tuna meat to "sea chicken" or "veal". Canned tuna in oil made in the United States is popular around the world and is one of the best-selling foods in the world.
Why is the temperature of tuna higher than the surrounding water temperature? It turns out that there are skin, muscle and blood vessel plexuses on both sides of its body. After careful research by scientists, the body temperature of tuna is 9°C higher than the surrounding water temperature. The force of muscle contraction is the main reason why these tireless, fast swimmers raise their body temperatures. The powerful muscles along both sides of the tuna spine and the large number of blood vessel plexuses on the skin indicate that the metabolism of these parts is particularly strong, so the meat of tuna is like beef and is purple-red. Among them, the hemoglobin content is very high, it is low in fat and high in protein, so it has high nutritional value.
Tuna swims very fast, reaching 20 nautical miles per hour. Professor Gott once said: "The tuna found on the coast of America today may have circumnavigated the Cape of Good Hope the night before." This doesn't have to be shared, but it shows how fast it can swim.
Tuna is found all over the world's seas and is a global ocean fishing target. In the past, it has been mainly produced by the United States and Japan. Since 1959, the former Soviet Union has also actively developed it. Because the tuna fisheries throughout the three oceans of the Atlantic, Indian, and Pacific Oceans are in the offshore and offshore waters of some small and medium-sized countries in Latin America, Africa, Asia, Australia, and Europe, the more the tuna fishery develops, the more it will become in line with many third world countries. Interest related. Historically, the tuna war in Latin America against the maritime hegemony of great powers has been witnessed by all the world.
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