With the increasing intensification of pond aquaculture, the eutrophication load of the aquaculture system gradually increases. At present, the main way to solve the eutrophication of aquaculture water bodies is to discharge and replace water and heterotopic treatment of tail water, but it is not in line with the era background of water resource shortage and rising pond rent in China. Therefore, it is of great significance to develop in-situ regulation technology and mode of aquaculture pond environment.
On the basis of Grasscarp, bighead and crucian carp polyculture ponds, the freshwater pond aquaculture ecological environment regulation and innovation team of Pearl River Fisheries Research Institute of Chinese Academy of Fishery Sciences determined the pond aquaculture capacity in combination with water quality indicators, fish feeding and aquaculture cycle and other parameters, and adjusted the fish load of the pond by rotation, forming a zero exchange aquaculture mode, with an annual output of 96000 kg/hm2. The results of a two-year study on the fate characteristics of biogenic factors and the accumulation of eutrophication showed that the zero water exchange mode did not cause water quality deterioration, but reduced the accumulation of nutrients and improved the utilization rate of substances. It is a green, ecological and efficient breeding mode of”water saving and land saving”. The relevant research results are”nutrition dynamics and balance of zero – water exchange Po”Nds of grass carp, Christian carp and bighead carp”was published on aquaculture (zone 1, Chinese Academy of Sciences, if=5.135), a mainstream journal in the field of aquaculture. The research was supported by national key research and development plan (2019yfd0900302), general program of National Natural Science Foundation (42077453), general program of Guangdong Natural Science Foundation (2018a030313412) and national bulk freshwater fish industry technology system (cars-46-17). Zhujiang Institute is the first unit to complete the paper, Dr. Zhang Kai is the first author, and researcher Xie Jun is the corresponding author.
The research results provide a theoretical basis for further understanding the zero water exchange model from the level of material circulation and energy flow, and then managing and optimizing the model from the ecosystem level.
Article link URL:https://doi.org/10.1016/j.aquaculture.2022.738565