Marine water pollution
Marine water pollution has become a global concern, which has a serious impact on the marine ecological environment and human health. There are many types of marine water pollution, mainly including the following aspects:
1 Chemical contamination
Industrial wastewater discharge
Many factories and enterprises discharge untreated wastewater directly into the ocean, which contains toxic and harmful substances such as heavy metals and organic matter, which seriously damages the marine ecological environment.
Pollution from agricultural fertilizers and pesticides
Some of the fertilizers and pesticides used in agricultural production enter the ocean through surface and underground runoff, leading to marine eutrophication, algae overblooms, and ecological disasters such as red tides.
Urban domestic sewage discharge
Municipal domestic sewage contains a large number of pollutants such as organic matter, pathogens and detergents, which will lead to eutrophication of seawater and affect the growth and habitat of marine organisms after being discharged into the ocean.
2 Biological contamination
Invasive alien species
With the rapid development of global tourism and tourism, alien species enter China's oceans through ship ballast water, cargo transportation and biological invasion, posing a serious threat to local marine biological populations.
Marine litter
Plastic waste, discarded fishing nets and other garbage exist in the ocean for a long time, which not only affects the marine landscape, but also may cause marine organisms to eat and entangle, endangering their survival and reproduction.
3 Thermal pollution
Hot water from power plants, industrial enterprises, and urban heating is discharged into the ocean, increasing the temperature of the sea, affecting the balance of the marine ecosystem, which can lead to the death of coral reefs and the decline of marine populations.
4 Oil pollution
1.Ship spills: Oil spills may occur during the transportation of ships, causing large-scale marine pollution. The spilled oil covers the surface of the sea, hindering the photosynthesis of marine life, and at the same time, the toxic substances in the oil enter the food chain and endanger the health of marine life.
2.Offshore oil exploitation and transportation: During offshore oil exploitation and transportation, oil spills may occur, causing serious damage to the marine ecological environment.
5 Nutrient contamination
Nutrients such as nitrogen and phosphorus emitted from agriculture, animal husbandry and urban life enter the ocean, leading to eutrophication of seawater, causing ecological disasters such as red tides and green tides, and posing a threat to marine life and human health.
Red tide. 
Green Tide. In order to protect the marine ecological environment, China has taken a series of measures, including strengthening the construction of laws and regulations, improving pollutant discharge standards, and increasing law enforcement. At the same time, the general public should also actively participate in the protection of the marine environment and reduce marine pollution at the source. Together, we make the ocean a better place. Chongqing Yueyu Chengxin Aquaculture actively explores a new aquaculture model - seafood land farming model, and contributes to reducing the pollution caused by seafood farming to the ocean.
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