Ecosystem Dynamics of a Microbial Biofloc Community Used to Culture Pacific White Shrimp (Litopenaeus vannamei)

摘要

Microbial biofloc systems are increasingly important toudraising Pacific white shrimp (Litopenaeus vannamei),udbecause they efficiently remove wastes produced by highuddensity cultivation and have the potential to provideudsupplemental nutrition and oxygen to the shrimp population.udGross primary productivity (GPP) and community respirationud(RESP) can easily be measured and used to characterize theuddominant processes in a system and how they relate toudshrimp growth, microbial productivity, and survival.udPhotoautotrophic, "green water", systems are algaluddominated as evidenced by high daytime GPP. By contrast inudheterotrophic or chemoautotrophic, "brown water", systems,udthe respiratory costs exceed the photosynthetic rate evenudduring daylight hours. RESP can also be used to betterudunderstand the relative contribution of the microbes andudthe shrimp to the total oxygen demand of the system.udFinally, clarifiers allow cropping of sludge in hopes ofudpromoting algal growth and a "green", photoautotrophicudsystem.