The reason why hairtail will die as soon as it comes out of the water is that hairtail lives in the deep sea. The deeper the water, the greater the pressure. Hairtail mainly lives in the sea below 30℃, and it is impossible to adjust the pressure difference between high and low pressure, so the pressure in hairtail is equivalent to that in the deep sea. When hairtail is caught by us, because the pressure in the outside air is much smaller than that in the hairtail, when the net leaves the water surface, because the pressure in the air is too small, it can't bear this pressure at once, causing fatal injuries inside the fish, such as the sudden expansion and rupture of the swim bladder.

In addition, in the blood of these fish, the oxygen originally absorbed by blood cells also presents a special "boiling" state because of the reduction of external pressure. Naturally, deep-water fish such as hairtail and yellow croaker will die as soon as they are caught out of the sea. The principle of this kind of self-explosion is actually similar to that of people's diving disease. The gas in body fluid quickly turns into bubbles due to the change of air pressure. The main effect is gas embolism, which will seriously burst some tiny blood vessels. For example, gills will be broken.

Fresh-keeping method of hairtail

Clean hairtail, dry it, chop it into large pieces, put some salt and cooking wine on it, and then put it in the refrigerator for freezing, so that it can be preserved for a long time and preserved for taste. If it is not frozen, it should be eaten as soon as possible.