The project ABBORÖS started in fall 2006. The aim was to study the possibility to farm perch in the archipelago in a way that meets both the requirements from the goals of environmental pro-tection for the Baltic Sea as well as the economical demands put upon a commercial business. The new questions addressed in this project are how perch can be farmed in Sweden and how to perform aquaculture in closed systems in the archipelago. New is also a systematic use of compe-tence of local fishermen to develop a sustainable aquaculture system. ABBORÖS is a joint ven-ture between the Royal Institute of Technology and eight fisherman families from the Swedish South East coast. The project is divided into two parts, the first with a budget of 1.3 million € started in October 2006 and finished in February 2008. The second part runs from June 2008 to June 2010 with a preliminary budget of 2.3 million €. During the project 10 people are having work opportunities and after the project the expectation is that 15-20 people will be engaged in this kind of aquaculture. The project will develop methods for how Perch can be cultivated in a recirculating systems in the archipelago, how much water that can be reused and how much of the nutrient loss that can be caught for alternative use compared to traditional net cage fish farm-ing. During the first year test systems with floating ponds constructed in fibre glass-armed PVC tarpaulin was built at different locations together with local fishermen, who were contracted as technicians. The fishermen joined together in the company Stannafisk AB with the ambitions to build eight ongrowing units with a yearly production capacity of 30 tons each and together con-struct a hatchery and a filleting plant. By farming perch the restaurants could be more evenly supplied during the year than by wild catch which gives mainly supply in springtime. This would create a possibility to make a living on a known product in a vanishing profession. By placing the ongrowing units in the vicinity of the families residential buildings, the energy and time used for transport can be kept to a minimum. The following years the systems will be operated at different conditions for optimization. The parameters addressed are fish density, cohort size, pond size, oxygen supply, sludge removal and ammonia removal. A final goal is to compare price and taste of cultured and wild caught Perch. Know-how of aquaculture techniques and juvenile production has been built with the help of a network of international experts during the first part of the pro-ject. The participants have increased their competence and their ability to cooperate. They have also installed a base structure for six farming units and built a capacity of fish production to 15 % of the proposed size at the end of the project. This implies that they are well prepared to make experiments in full scale during the second part of the project. After the first year approximately 200 000 perch are hold in the six units. The first fishes are expected to reach a market size of 400 grams three summers after hatching, which means in September 2008. For the Royal Institute of Technology and other interested research groups engagement in the project gives admission to a field laboratory with technicians for experiments and research on aquaculture and environmental technology.