Eutrophication Assessment Of Bohai Bay Coastal Sea Maricultural Area

The development of the seawater aquaculture industry bring certain economicbenefits, but also caused some impact on the surrounding marine environment. Bohai Baycoastal waters is a concentrated area of marine aquaculture, land-based sources into a seaof sewage and sewage disposal at sea receiving spaces, due to its special geographicallocation, water circulation is slow, the breeding process pollutants can’t dilution andproliferation, caused the pollutant concentration, to a certain extent exacerbated theeutrophication of the sea.Eutrophication is the material basis of occurrence of red tide, socontrol the breeding of regional state of the environment, can effectively control theeutrophication of the sea, there by reducing the red tide the frequency of occurrence andhazards. Seven culture zones of the coastal waters of Bohai Bay monitoring study in2010found that:1. The sea water quality in general, excessive pollutants were inorganic nitrogen andphosphate, inorganic nitrogen, individual farming district exceeded the rate of100%putthe bait of this situation and culture zone of excessive nutrition, aquaculture water salt hasnot taken effective control of a certain relationship.2. The overall condition of the four culture zones to carry out sediment monitoring,have reached a class of marine sediment quality standards.3. Five biological quality monitoring culture zones, there are good biological quality ofthree culture zones, Swimming crab exceeded the phenomenon of the Huanghua Li Jiapubreeding area is the most serious.4.Comparison of eutrophication in accordance with the selected three differentbreeding types of farming area,the factory farm better than pond aquaculture, pond cultureis superior to the end of the sowing culture.Bohai Bay inshore increase in the breeding waters of the most important ecologicalproblems is water quality environmental issues, the high parts of the ocean mariculturalarea seawater inorganic nitrogen and active phosphate indicators, leading to the water bodyor severe eutrophication phenomena, has an impact on farming the main factors ofenvironmental quality, the main reason for breeding pollution and land-based sources ofsewage.