Normal.

There is no water in the swim bladder. The swim bladder, commonly known as the fish bubble, is a depth and depth regulator for fish when swimming. It is also a lifebuoy for fish when swimming. It can adjust the specific gravity of the fish body by inflating and deflating.

The fish bubble is actually the fish belly, located in the lower abdomen of the fish. It is one of the important organs used by fish to store food, digest food, and absorb nutrients. Fish bubbles are a high-protein food, rich in nutrients and not easy to chew. However, the cholesterol is relatively high, which is not good for people with arteriosclerosis and cardiovascular and cerebrovascular diseases. It can be fried, braised and other cooking methods. It is a very unique delicacy.