In order to protect the water quality of fishery waters and ensure the normal growth and quality of fish, shrimp, shellfish and other aquatic products, this standard is formulated in accordance with China's "Environment Protection Law", "Water Pollution Prevention Law", "Marine environment Protection Law" and "Fisheries Law". The standard is applicable to the seawater and freshwater environment of fishery spawning grounds, bait farms, wintering grounds, migratory channels and aquaculture areas. It involves the determination methods and limits of water quality indicators such as pH value, hexavalent chromium, total mercury, lead, cadmium, etc., with the aim of preventing and controlling water pollution and ensuring the sustainable development of fishery ecological environment.