I have lived in Guangdong for more than eight years, so I am half Cantonese. I can often eat sea fish, all kinds of sea fish. Because every time I eat sea fish, it is salty, so I always think that sea fish are salty, because they live in sea water, and sea water is salty. But some time ago, my mother put the sea fish on the table again and asked her: Is the sea fish really salty? She smiled and said, Hehe, I used to think so, but marine fish is not salty, because we put salt in it every time we steam it. It's good to talk less, do more and ask more questions, but I think my own answers and conclusions belong to me. Attached information (from Baidu): The meat of marine fish is not salty. Fish living in the ocean drink salty and bitter water all the time, but why is their meat not salty? This is because all the fish in the ocean have their own "desalter", which can discharge the salt in drinking salt water in time. This "desalinator" is different from teleost and cartilaginous fish. Skeleton fish in the ocean have strong ability to discharge salt, and they have special organs to discharge salt. These organs grow in fish gills and consist of "chlorine-secreting cells". "Chlorine-secreting cells" can secrete chloride, just like the "fresh water workshop" on fish, which can desalinate seawater entering fish, and the efficiency is quite high, even the most advanced "seawater desalinator" in the world is far behind. In order to make up for the loss of water, they take the method of drinking more water and urinating less to maintain the low osmotic pressure in the body. The "desalinator" of cartilaginous fish (such as sharks) in the ocean is another way. It is not a "chlorine-secreting cell", but uses urea in the body to discharge salt. The urea content in their bodies is almost 100 times that of other aquatic animals. These urea can not only maintain the hypertonic pressure of body fluids, reduce the salt penetration, but also accelerate the salt excretion in the body, so they are called "life-saving drugs" for cartilaginous fish. In addition, there are fish like eels that can breed and live in the ocean and grow and develop in fresh water.