oysters, crabs, scallops, sea fish Seafood is favored by consumers because of its delicious taste and rich nutrition. But although seafood is good, you should pay attention to safety when eating it. “Life times” interview industry experts, tell you how to eat seafood to ease your mind.


the white foam floating on the estuary of Yangtze River Delta, red tide cyanobacteria of Pearl River in recent years, more and more industrial wastewater and domestic water are discharged into rivers, lakes and seas, and the environmental pollution is becoming increasingly serious. Chen Shunsheng, director of the Department of aquatic product processing and storage engineering, School of food, Shanghai Ocean University, pointed out that fish is the first to suffer from seawater pollution. Electroplating, lead materials, batteries, metallurgy and other materials contain a large number of heavy metals. If these chemical materials are not treated harmlessly and directly discharged into rivers, lakes and seas, the water quality will be polluted, and lead, cadmium, mercury and other toxic heavy metals will seep into the fish and pollute Contaminated water.

Chen Shunsheng explained that nature follows the survival law of “big fish eating small fish, small fish eating shrimp”. Small fish often eat seaweed, shellfish, etc. once the water quality deteriorates, algae, fish and shrimp will “deteriorate”, and eventually human beings at the top of the food chain will eat a lot of heavy metals. Many studies have shown that human intake of heavy metals can easily lead to mental impairment, skeletal abnormalities, neonatal malformations and other consequences. Therefore, we must avoid excessive intake of heavy metals. However, it is difficult to distinguish the contaminated seafood by naked eyes. Chen Shunsheng suggested that the following points should be paid attention to: “ask the producing area before purchasing”


“. Before buying seafood, you should ask and know the producing area, because different producing areas will affect the pollution degree of seafood to a certain extent, so we should try to avoid producing areas with heavy industrial pollution. For example, in China’s industrially developed Yangtze River Delta and Bohai rim areas, due to the industrial development, large population, and narrow bay shape, it is not conducive to the diffusion of pollutants. Therefore, the fish and shellfish produced in the offshore and shallow waters of these areas will be significantly polluted. Comparatively speaking, the seafood pollution in Zhoushan and Qiandao Lake areas of Zhejiang Province is less. The best choice for


is small offshore fish. In addition to the factors of production area, the river entrance or sea entrance is also the location with high concentration of pollutants, so it is difficult to avoid the pollution in offshore area. Therefore, shellfish in areas with serious industrial pollution discharge should not be eaten. It is recommended to eat offshore fish with less pollution and far away from land, especially smaller offshore fish, because some large marine fish are in a higher food chain, and pollutants are more likely to accumulate. Small fish, chub mackerel and sardine, have short growing period and limited pollution capacity.


were used to control the intake. Heavy metals can not be biodegraded. Once they enter the seafood organisms, they will be enriched under the amplification of the food chain, and finally enter the human body. Therefore, it is suggested that people should not eat too much seafood. It is advisable to eat 100-200 grams of seafood each time, 2-3 times a week. When the production area is not clear, eat 1-2 pieces of raw oysters, crabs, scallops and other seafood each time.


eat less fish head and viscera. Large marine organisms generally have liver, which not only detoxifies itself, but also enriches heavy metals in liver. Fish head and gill are also easily polluted by heavy metals. Even for freshwater fish or artificially raised fish, it is recommended to eat less fish head, viscera and other parts.


are not effective in detoxification. When eating seafood, many people are used to dip in some ginger juice, mustard sauce and other seasonings, think it can kill bacteria and detoxify. But in fact, these practices can kill bacteria and remove peculiar smell to a certain extent, but have no effect on the prevention of heavy metals.

finally, Chen Shunsheng reminded that many foods in our lives contain heavy metals, and the key lies in the size of the risk and the intake. If you eat seafood occasionally and pay attention to control the quantity, the health risk is limited, so we don’t have to panic too much. ▲

Leave a Comment