Use of aspirator-type and paddlewheel aerators in membrane-linedshrimp ponds operated under limited discharge

摘要

Targeting higher shrimp biomass in intensive shrimp ponds requires supplemental aeration to maintain adequate dissolved oxygen (DO) levels and to strip out carbon dioxide. The aeration technologies can be adopted to increase DO levels in the pond water and help reduce water quality problems that can result in poor shrimp performance. To increase biosecurity, minimize the risk of losing crops due to disease outbreaks and to reduce potential negative environmental impacts from effluent water on receiving streams, producers and researchers are developing shrimp culture technologies for limited discharge or closed recirculating systems. In ponds operated with limited discharge, aeration and mixing devices have been used to suspend particulate matter and enhance the development of bacterial flocs in the water column. These bacterial flocs help in the nitrogen cycling process and provide a supplemental food source for the cultured animals in the ponds. Aeration devices being used in shrimp culture operations include pump sprayers, propeller aspirator-pumps, paddle-wheels and diffused air systems.