Title: Dynamic Change and Circulation of Nutrients in Polyculture System of Sea Cucumber (Apostichopus japonicus) and Shrimp(Fenneropenaeus chinensis)
Abstract: The N and P content in water and sediment of aquaculture system were investigated from April 2011to September 2011.Effect of sea cucumber monoculture(pond S)and sea cucumber-shrimp polyculture(pond SS)on the dynamic change and circulation of the nutrients were determined.The average content of total nitrogen(TN)was(1.16±0.13)~(2.64±0.09)mg·L-1in pond S and(1.24±0.08)~(2.55±0.09)mg·L-1in pond SS,while that of total phosphorus(TP)was(0.03±0.01)~(0.08± 0.01)mg·L-1in pond S and(0.03±0.01)~(0.09±0.02)mg·L-1 in pond SS.The average content of dissolved inorganic nitrogen(DIN)was(0.10±0.03)~(0.32±0.05)mg·L-1 in pond S and(0.16± 0.03)~(0.45±0.02)mg·L-1 in pond SS.These three indicators significantly decreased at late experimental stage,which was discrepant to other models in which animals were fed,indicating that our models did not load nutrients to water.TN and TP in the sediment of two ponds did not change significantly after experiment(P0.05),indicating that our model did not accumulate N and P nutrients in sediment.Correlation analysis showed that ammonium in sediment and water significantly correlated in a negative manner(P0.05),indicating that bioturbation promoted the exchange of nutrients between sediment and water.In August and September,the content of PN in water and the ammonium in sediment of pond SS were significantly lower than those in pond S(P0.05),and the sedimentary flux of suspended particulate matter in water relatively increased in pond SS,while the concentration of TN and DIN in water of pond SS were higher than those in pond S,indicating that the polyculture of sea cucumber with shrimp accelerated the transportation of nutrients among units of culture system,and prevented deterioration of underwater environment due to excessive accumulation of nutrients in sediment,making the nutrients dynamically change and virtuously cycle,and more nutrients be used by cultured animals.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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Cited By Count: 2
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