The Environmental Impact Study Of The Chlamys Farreri Raft-style Culture In Sanggou Bay

Due to the long high-density aquaculture, shellfish metabolites of the environmental emissions, waste and other organic matter,make the environment pollution grow. N, P, COD in water and other content increased, the original chemical balance of water produced a corresponding change, often to potentially harmful organisms to create a good breeding conditions, to the culture environment pressure. Shellfish metabolites of particulate not only changed the composition of sediment benthic biodiversity and biogeochemical cycles, but also self-pollution caused by farming area; by culture area of sea pollution has become increasingly prominent.To solve the above problems, this paper in May , August , November 2010 and January 2011 invests Sanggou Bay aquaculture waters,from the excretion of metabolites, nitrogen, phosphorus, carbon balance, metabolites of the sea environmental impact assessment and metabolites on the sedimentary environment impact assessment of four aspects of raft culture Sanggou Bay region of the state environmental quality in a more systematic analysis and evaluation, establish raft culture Sanggou Bay Scallop environmental impact evaluation methods,and provide technical support in the research of the reltionship of the environment quality and aquaculture product quality issues.The main work is as follows:1. Scallop farming excretion of metabolitesUse of ecological simulation experiment and the method of combining on-site monitoring of scallop soluble and particulate excretion of metabolites, the establishment of a dynamic estimation model for excretion, and with real determination, according to the results of field verification and correction. The results showed that: Szie and season effect scallops'excretion, the bigger size,the more excretion, Especially in August. The dissolved and particulate ratio, different specifications of the scallop is slightly different. Carbon, nitrogen and phosphorus excretion rise overall with the temperature. Coupling season, size factors to build a scallop farming cycle dynamic equation:Carbon is y = 56.70+0.21x+7.18×10^-3x²+ 6.11×10^-6x³ -7.68×10^-8x⁴;Nitrogen is y = 5.57-1.43×10^-2x +7.29×10^-4x² -1.88×10^-6x³;Phosphorus is y = 20.61 + 0.70x -1.97×10^-2*x² + 2.25×10^-4x³ -5.85×10^-7x⁴。2. Scallop farming nitrogen, phosphorus, carbon income and expenditure According to the principle of material balance, through laboratory simulation experiments carried out on the raft culture of scallop shellfish tissue, soluble metabolites, metabolites of particulate nitrogen, total phosphorus, organic carbon determination, the establishment of shellfish culture of nitrogen, phosphorus, carbon material balance equation, calculation scallops nitrogen, phosphorus, carbon balance, the mechanism of contamination of shellfish aquaculture. The results showed that: Scallops absorbed nitrogen, phosphorus, organic carbon content is much higher than that of the solid waste of nitrogen, phosphorus, organic carbon content, scallop farming in general in the environment can absorb nitrogen, phosphorus, organic carbon and other nutrients.3. Metabolites of cultured marine scallop Environmental Impact AssessmentBy monitoring marine shellfish farming areas chemical parameters (temperature, salinity, pH, DO, COD, inorganic nitrogen, phosphate, oil, Hg, As), evaluate the marine environmental qualitya of culture area,using the methods——index of eutrophication, organic pollution assessment index and composite index of water quality.And assess the environmental impact of the marine shellfish metabolites. The results showed that: Water in May has a high level eutrophication and serious pollution condition. Other months there was a slight water pollution.4. Metabolites of cultured scallops sedimentary environment impact assessmentRefer to Norwegian Ervik and other people proposed MOM (Modelling-On-growing fish farms-Monitoring) system, through the biological parameters, chemical parameters and sensory evaluation of indicators, three comprehensive evaluation of a subset of shallow sea shellfish aquaculture raft Sedimentary environmental quality. The results showed that: the sedimentary environment quality in Sanggou Bay raft culture areas maintais the second states.