The reason why hairtails die immediately when they come out of the water is because hairtails are deep-water fishes in the ocean. They bear huge water pressure underwater, but their bodies also have outward expansion pressure on the water, so they will not be squashed. On the water surface, because the atmospheric pressure is much lower than the water pressure, there is a pressure difference. The air pressure is small and the pressure in the hairtail is high. Therefore, the pressure in the hairtail's body rapidly expands outward, breaking through the internal organs, and the hairtail dies.

Hairtails mainly live in waters below 30 meters. During the winter, they go to about 60-100 meters of water. They only migrate to shallow seas when they spawn. Hairtails die when they come out of the water. This is mainly because the internal pressure in the deep sea - The pressure changes on the sea surface cannot be adjusted, so the hairtail fish we see in the market are often full of belly. Hairtail is a migratory fish and is basically caught in major fishing grounds.