摘要
Abstract
Since the 1970s,the pursuit of high efficiency and output has driven aquaculture toward intensive and large-scale production,exemplified by flow-through and static high-density systems.While these models achieve high yields,their excessive biological loads and resource inputs result in severe resource waste and water pollution,hindering sustainable development.To overcome these limitations,In this study,we constructed a small-scale multi-trophic serial recirculating aquaculture(MSRA)system with four nutrient utilization tiers of Micropterus salmoides,Chlorella sp.,Hyriopsis cumingii,and Vallisneria natans in series.Compared the operation,biological growth,water purification effect,and nitrogen utilization rate between the MSRA system and monoculture aquaculture(MA)system,the MSRA system demonstrated superior performance:Fish survival was improved in the MSRA system,based on biomass growth and feed utilization efficiency,which were 1.68 and 1.65 times higher,respectively,in the MSRA system than the MA system.The MSRA system effectively purified the aquaculture wastewater and significantly reduced the chemical oxygen demand and the total ammonia nitrogen and nitrite(NO2--N)concentrations(p<0.05).The nitrogen-use efficiency of the MSRA system was 27%higher than that of the MA system,and 11%higher than that of a traditional aquaponics system.These results showed that this aquaculture model realized zero discharge of aquaculture wastewater and improved the level of nutrient recycling within the system.关键词
多营养级养殖/串养模式/养殖尾水/系统生态学/氮素利用率Key words
multi-trophic aquaculture/sequential rearing mode/aquaculture tailwater/system ecology/nitrogen utilization efficiency分类
农业科技
