It is caused by mariculture. In recent years, many "black-hearted" enterprises have discharged sewage without reaching the qualified standard, and even secretly buried sewage discharge pipes into dams and discharged them into Zhanjiang. In the absence of human supervision, the water quality in Zhanjiang has changed and become polluted.

because mariculture can bring huge economic benefits, local farmers breed a large number of prawns, and the tail water of the aquaculture is directly discharged into the sea, which seriously pollutes the seawater environment, so the silver beach turns black.

Extended information:

Modern people need detergent to wash vegetables and washing powder to wash clothes. The use of these chemicals will also cause domestic sewage pollution. The water quality of these domestic sewage becomes more complicated. For example, phosphorus-containing washing powder will pollute the water quality. Poor supervision of domestic sewage discharge is also the cause of water quality problems in lakes, oceans and rivers.

domestic water needs to be purified before it can be discharged, and the related purification facilities are not up to standard and are discharged without strict purification, which is also the reason for the change of water quality in Zhanjiang.