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This paper is a summary of an in-depth study of key factors in the function of a 7-year-old aquaculture system designed for treatment and recycling of domestic wastewater at Stensund，Trosa，Sweden.The reported areas are: wastewater flows， reduction of biochemical oxygen demand (BOD)， chemical oxygen demand (COD)， phosphorus， nitrogen， and fecal bacteria. Plant production is recorded as harvested biomass， and energy results are given as generated heat and electricity consumption. Special studies were conducted on the reduction of copper by anaerobic treatment. Nitrification was studied with different filter media. Microalgal autofocculation of phosphorus was studied in relation to pH and water hardness for the green algal genus Scenedesmus. Limiting actors for the growth of Daphnia magna in the ooplankton step of the constructed aquatic food-web was studied in a specially designedreproduction test. The results are nalyzed in order to optimize the function of the wastewater aquaculture. © 1998 Elsevier Science B.V. All rights reserved.