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What is that white stone in the tail of hairtail?
Imported hairtail is a kind of tropical fish, and the cobblestone bone on the back is the root of the fin.

Details are as follows:

1. Hairtail belongs to trichiuridae of Perciformes, belonging to Vertebrate Subdivision of Chordata. Also known as saury, nepotism, fat belt, oil belt, toothfish and so on. , is fierce. Qingdao and Rizhao city along the Yellow Sea are called snakeheads. Hairtail is flat as a ribbon, silvery gray, with light gray dorsal fin and pectoral fin with tiny spots, and its tail is black. Its tip is larger, and it gradually tapers towards the tail, twice as high as the head, and its total length is about 1 m.. It is fierce and mainly feeds on shrimp and squid. Mainly distributed in the western Pacific and Indian Ocean.

2, hairtail swimming ability is poor, floating in the middle of the sea during the day and falling to the bottom of the sea at night. When resting, head up, body vertical, only by waving dorsal fin and pectoral fin, eyes watching the movement on the head. If the prey is found, the dorsal fin vibrates rapidly, the body bends and pounces on the food. Hairtail has the characteristic of queuing in groups. Every spring, the water temperature rises, and hairtail swims to the shore in droves, from south to north, which is the fishing season. On the solstice of winter, when the water temperature drops, hairtail will swim to the deep water to avoid the cold.

3. Hairtail is rich in fat, protein, vitamin A, unsaturated fatty acids, phosphorus, calcium, iron, iodine and other nutrients. Hairtail is warm and sweet, and has the effects of warming stomach, moistening skin, invigorating qi and nourishing blood, strengthening body constitution, strengthening heart and tonifying kidney, relaxing muscles and tendons, promoting blood circulation, diminishing inflammation and resolving phlegm, clearing brain, relieving diarrhea, relieving fatigue and nourishing essence.