What are the producing areas of tuna?

Tuna meat is delicious and tender, which is rich in protein, minerals, vitamins and other nutrients, is a highly respected healthy food. So what are the producing areas of tuna?

I. tuna producing area

Tuna producing areas are distributed in tropical and temperate sea areas all over the world (latitude between north and south is 40 °), and the central concentrated area is in the sea area near the equator. Tuna producing areas in China are distributed in Xisha, Zhongsha, Nansha Islands and the East China Sea.

II. Tuna species

1. Yellowfin tuna: the fish is spindle-shaped, slightly flattened laterally, the head is small, the tail is long and thin, and the meat is pink. The back of the body is bluish blue, the side of the body is light gray, with a little yellow, and the two dorsal and anal fins of adult fish and the small fins behind them are all bright yellow. Yellowfin tuna is widely distributed in the equatorial waters of the three oceans and is the representative species in the tropical sea area.

two。 Bluefin tuna: the largest species of tuna, also known as blackfin tuna. A short, sturdy, tapered, slender body with a forked caudal fin; the bottom to side of the body is brightly colored, the upper body is dark blue, the fin is dark dark, the small fin is yellowish, and the caudal stalk eminence ridge is black. The perched water layer is from the surface to the depth of 50 meters, and the most suitable water temperature is 10-20 ℃. The bait is mainly herring, sardines, mackerel, squid and crustaceans.

3. Bigeye tuna: also known as fat tuna and sub-tuna, the body length is about 1.5-2.0 meters, the body weight is more than 100 kg, generally 160-350 kg. The back is blue and blue, and the side and ventral face are silvery white. The meat is pink and slightly soft. The pectoral fin is long, its end is very protruding, reaching below the second dorsal fin, and the second dorsal fin is also narrow, which is similar to the height of the first dorsal fin. The fish has a gray body, fat, short tail and large head and eyes. Bigeye tuna inhabit deep water, up to 200-300 meters, and sexually mature individuals inhabit the surface.

4. Long fin tuna: the back is dark blue, the side and ventral side are silvery white, and the body color is uniform. The body length is 1 to 1.5 meters and the weight is about 15 kilograms. Large individuals can weigh up to 45 kilograms. The most prominent feature of this species is that the flesh is pink, the pectoral fin is knife-shaped and extremely long, and the length is longer than the head. Albacore tuna is mainly distributed in 90-150 m water layer during the day, sometimes as deep as 150-200 m deep, and near the surface in the evening. The suitable temperature range of albacore tuna is 14-20 ℃. The bait is mainly sardines and crustaceans.

5. Masu tuna: also known as bonito, tobacco, small string, firewood, tobacco tiger, is one of the suborder mackerel suborder mackerel of radioptera. Distributed in the warm waters of the world's oceans. The length is 40-70 cm. The maximum body length is 111 cm. The maximum weight can reach 34.5 kg. The body is spindle-shaped, flattened on the side, dark on the back and white on the abdomen, and there are 4-10 thick cyan vertical lines, tip of the mouth, most of them scaleless. Lives in temperate and tropical waters, and has seasonal migration. It is an important edible fish, mostly used as sashimi (sashimi) and fish pine.

Tuna has many varieties and rich nutrition, so it is suitable for middle-aged and elderly people to eat. If there are conditions, you can eat more.