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 fish's respiratory organs are gills, which stick together in the air, so the effect of breathing will be greatly weakened. Therefore, after leaving the water, the fish will basically die of lack of oxygen, and only in the water can they breathe normally.

1. Why do fish need oxygen? 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 fish's respiratory organs are gills, which stick together in the air, so the effect of breathing will be greatly weakened. Therefore, after leaving the water, the fish will basically die of lack of oxygen, and only in the water can they breathe normally.

2. What are the respiratory organs attached to fish? 1. swim bladder: swim bladder is the organ of bony fish, and its function is to adjust the gas, thus changing its own density and allowing fish to float or dive.

But for African lungfish, its swim bladder structure is somewhat similar to the lung, which can be used to store oxygen, thus helping fish breathe.

2. Skin: Bullet fish can absorb oxygen by using the respiration of skin and oral mucosa.

This kind of fish is a small bottom fish, which can go ashore at low tide and jump on the beach for food with powerful pectoral muscle handles.

3. Intestine: For loach, in addition to gills, you can also breathe air with the intestine.

This kind of fish can be found in rivers, lakes and ponds. It usually lives underwater. If the water source 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.