基于Ecopath模型的淡水虾蟹池塘多营养层级养殖模式OA北大核心CHSSCDCSTPCD

[Objective]The objective of this study is to clarify the effects of adding Macrobrachium rosenbergii to the integrated multitrophic aquaculture system of freshwater shrimp and crab,estimate the optimal stocking density for M.rosenbergii,and provide a basis for the application and promotion of this aquaculture model.[Method]A mixed culture experimental group of Eriocheir sinesis,M.rosenbergii,and Macrobrachium nipponense,as well as a control group of traditional mixed culture E.sinesis and M.nipponense were taken as the research objects.Based on annual measured data and reference materials,two Ecopath models of the ecosystem were constructed using EwE 6.5 software to analyze the nutrient structure and energy flow characteristics within the two ecosystems.[Result]The fodder ecotrophic efficiency(EE)of the experimental group was 0.940,significantly higher than the control group's 0.789(P<0.05),indicating that adding M.rosenbergii to the system can improve the utilization efficiency of fodder.The transfer efficiency(TE)value of the secondary nutrient level in the experimental group was 0.203,which was higher than the control group's 0.187,indicating that the addition of M.rosenbergii improved the secondary production utilization rate in the system.The Connectance index,System Omnivory index,and Shannon diversity index of the experimental group were 0.395,0.227,and 1.318,respectively,which were higher than the control group's 0.390,0.214,and 1.243.This suggested adding M.rosenbergii to the system enriched the food web and energy transfer pathways,thereby improving system stability and maturity,and increasing system diversity.By adjusting the biomass of the experimental group of M.rosenbergii,its ecological capacity was estimated.When the biomass of M.rosenbergii increased to 1.35 times the current level,it reached an ecological capacity of 36.32 t/km2.[Conclusion]The maturity and stability of the multitrophic aquaculture system formed by adding M.rosenbergii in shrimp and crab ponds are superior to transditional shrimp and crab mixed culture system,and the optimal stocking density for M.rosenbergii is 303.75 kg/hm2.