In order to adapt to the environment, the physiological function of deep-sea fish has changed a lot. These changes are reflected in the muscles and bones of deep-sea fish. Due to the huge water pressure in the deep sea environment, the bones of fish become very thin; But also easy to bend; Muscle tissue becomes particularly flexible and fiber tissue becomes surprisingly fine. More interestingly, the fish skin tissue becomes only a very thin layer, which can make the physiological tissue in the fish full of water and keep the balance of internal and external pressure. This is why deep-sea fish will not be crushed under such great pressure.
In addition, the eyes of deep-sea fish have become very strange. Our common goldfish is not only very bright in color, but also very big in eyes, and it is fun. Compared with goldfish, fish living in the deep sea have much richer eye structures than goldfish. Generally, fish's eyes mostly grow on both sides of the head, while those of fish living in the deep sea grow on the back of the head. Seen from the front, the two big eye frames of the fish are just like two light bulbs erected. From top to bottom, the eyes are like two big circles, occupying the "fortress" part of the head. What's more interesting is that this kind of fisheye can move up and down, left and right, and its eyeball structure is similar to that of a telescope, and it can also adjust the focal length freely. The peculiar eye structure is almost a physiological feature of deep-sea fish.
Hairtail will "commit suicide" as soon as it is caught. Hairtail is a common fish in the sea, and it will die soon after dehydration, so it is difficult to see live hairtail. If you need live hairtail, you need to prepare a water tank on the fishing boat and put it in immediately after catching it, so you can have live hairtail, but because this fish is too common, fishermen generally don't do this.