科研之友
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摘要
To solve the environmental pollution of wastewater in traditional aquaculture and promote the sustainable development of pond aquaculture, based on newly built container recirculating aquaculture system, the tertiary aquaculture wastewater-ponds ecosystem model was built, the evolution of wastewater quality, phytoplankton, aquatic animal biomass and pond ecosystem were simulated for 6 months, and the simulation of two scenarios of adding submerged plants and filter-feeding fish was set. The results showed that the trends of simulated values were basically consistent with that of the measured values, the average relative error between simulated and measured values ranged from 4.989% to 23.37%. Under the set conditions by simulation and in the prediction period, the structure of pond ecological system approached stable, the pond ecosystem formed an aquatic community dominated by green algae, chironomid and copepods. Adding submerged plants to the wastewater-purification-ponds had no obvious removal effect on nitrogen and phosphorus, while increased the concentration of dissolved oxygen in water, the maximum variation rates of the three ponds were 23.11%, 45.39% and 77.90%, respectively. Adding low-density filter feeding fish was beneficial to phytoplankton biomass growth, the maximum increase rates of diatom, green algae and cyanobacterial biomass in 3 ponds were 89.80% 47.22% and 22.06%, 76.95% 54.05% and 23.29%, 45.99% 33.37% and 20.30%, respectively. To sum up, AQUATOX was used to build the linked-ponds' ecosystem model, and the model was used to simulate the biological treatment methods of adding submerged plants and low-density filter-feeding fish, which can not only provide reference and help for managers to adjust the feeding structure, but also be used to regulate the composition of aquatic ecosystems, it is conducive to the restoration and balance of aquatic ecosystem functions. The results of this research may provide an important reference for managing the feeding structure of container recirculating aquaculture system, constructing the restoration ecology of wastewater-ponds and improving other aquaculture models using biological treatment techniques.
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