Freshwater fish oil is edible. When cooking fish, put the fish oil in the pot and cook it together, which will make the fish meat more tender.

The commonly referred to as fish white is neither fish oil nor fish swim bladder. The fish oil is slightly transparent and mostly adheres to the liver and intestines; the fish's swim bladder is a bag-like organ (hollow) that controls the fish's ups and downs. The fish white is a long and narrow white strip that is only found in male fish. It is actually the sperm vesicle of the male fish. Fish oil, fish maw, and fish whites are all edible. The intestines of big herring (about 10 pounds in total) can also be eaten after being washed, and it is a famous dish.

Be careful not to break the fish gall when handling fish oil, swim bladder and fish whites . If the fish gallbladder is broken, you can immediately soak the fish oil and other things in vinegar, and then wash it after a while, and it will no longer be bitter.