? Although fish live in water, they also need oxygen to breathe. Oxygen is the key substance of metabolism, so it is indispensable for fish. It is worth mentioning that the respiratory organs of fish are gills, and the gills will stick together in the air, so the effect of breathing will be greatly reduced, so the fish will basically die of lack of oxygen after leaving the water, only in the water can they breathe normally.
of fish? 1. Swim bladder: Swim bladder is the organ of bony fish. Its function is to regulate gas, thus changing its density, so that fish can float or dive. But for the African lungfish, its swim bladder structure is somewhat similar to the lungs, which can be used to store oxygen to help the fish breathe.
2. Skin: The mudskipper can use the respiration of skin and oral mucosa to absorb oxygen. This fish is a small bottom fish, which can live ashore at low tide and jump on the beach with the help of a powerful pectoral muscle stalk to feed.
3. Intestinal tract: For loach, besides gills, it can also breathe with intestinal tract in the air. This kind of fish can be seen in rivers, lakes and ponds. It usually lives at the bottom of the water. If the water dries up, it will get into the mud. As long as there is a small amount of water in the soil, it will not die.
