Comparison of Ecological Restoration between Different Polyculture Models with Anodonta woodiana and Hypophthalmichthys molitrix, Aristichthys nobilis in Chinese sturgeon Acipenser sinensis Culture Pond
1. College of Fisheries and Life, Shanghai Ocean University, Shanghai 201306, China; 2. Superintendency Department of Shanghai Yangtze Estuarine Nature Reserve for Chinese Sturgeon, Shanghai 200092, China
The result of a contrast test of ecological restoration between different Chinese sturgeon polyculture models with freshwater mussel Anodonta woodiana and Hypophthalmichthys molitrix,Aristichthys nobilis indicated concentration of NH4+-N was maintained at about 0.50 mg·L-1 and near absence of A.woodiana's influence.Total phosphorus removal efficiency of A.woodiana was quite high,but A.woodiana had no effect on total nitrogen.The total nitrogen removal rate of pond 3(polycultured with H.molitrix and A.nobilis) was greater than that of pond 2. A correlation analysis of TSS,NH4+-N,TN,TP concentration of Acipenser sinensis culture ponds under different treatments indicated total suspended solids also played an important role in the nitrogen removal,While phosphorus removel was not obviously associated with total suspended solids.Polyculture with H.molitrix and A.nobilis excels the treatment hanging A.woodiana in ecological restoration effects in the Acipenser sinensis culture ponds with muddy water and high concentration of total suspended solids.
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