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| Study on terrestrial industrial microcirculatory technology of Nile tilapia（ Oreochromis niloticus） in intensive pond |
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| Abstract: |
| The trial was conducted to study the water-saving and energy-saving effects，mechanism and culture benefit of the terrestrial microcirculatory industrial aquaculture technology for Nile tilapia（ Oreochromis niloticus） in intensive pond. The results showed that during the 183 days of Nile tilapia cultivation trial，the treatments saved 74.7% water than the control significantly（ P<0.01），whose average rate of water exchanged was only 1.4% per day.The concentrations of major water quality parameters in the treatments，as pH，NO3-，DO，Tur，TAN，NO2-，COD，fit related national standards of aquaculture water quality，and Tur，TAN，NO2-，COD had significant differences（P<0.01） between the treatment and the control except the density of pH and NO3-，moreover，the relative density of blue-green algae was smaller（P<0.01）. The treatments increased Nile tilapia harvest size，yield and growth rate with 13.8%（ P<0.05），38.7%（ P<0.01） and 14.4%（ P<0.05），respectively，and decreased the feed conversion rate with
12.3%（ P<0.05） than the control，there was a net increase profits of 14.397 thousands Yuan/hm2. In conclusion，the terrestrial microcirculatory industrial aquaculture technology of Nile tilapia in intensive pond had advantages，such as significantly saving water and energy，reducing pollution，safety，low investment，convenient operation，and easy for extension. The technique would promote the transition of aquaculture development from highly costing resources to saving resources and becoming environment friendly. It，after all，might be an ecological，healthy and efficient aquaculture model. |
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