Large carnivorous fish with slow growth, such as sharks, are at the top of the marine food chain. During the long-term process of "Big Fish eat small fish", they will ingest mercury from other fish and accumulate in muscles in large quantities, mainly methylmercury. Studies have shown that methylmercury is a neurotoxin, which can affect human brain, spinal cord, liver and kidney, etc., especially causing cardiovascular defects in infants and premature delivery of fetuses. Food regulators in the United States and Britain have advised young children and women of childbearing age not to eat shark products. Contrary to the popular function of "shark's fin strengthening yang", excessive mercury may also be related to male infertility.

As far as ecological protection is concerned, excessive consumption of shark fins has become the main reason for the accelerated extinction of shark populations. The recorded global shipment of shark fins is more than 10,000 tons per year, and shark fins only account for 1% to 5% of the shark's weight. According to this, it is estimated that millions or even tens of millions of sharks are killed every year. Shark catchers cut off the fins of shark's back, chest, abdomen, buttocks, tail and other parts in order to increase the shipment of shark fins, and then threw them back into the sea. These "broken-winged" sharks slowly bled to death within two or three months, which seriously affected the health and stability of the marine ecological chain.

Therefore, it is recommended not to eat shark fin! ! ! !