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Basic knowledge about the lives of many fish species is still lacking, but new technologies could be a breakthrough for future fisheries management. In a new project, researchers want to track fish individuals and use ultrasound to map fish throughout the Baltic Sea: spawning patterns, migration routes and behaviour. The technique is part of fisheries management and conservation plans for endangered fish. Report from Örsundaån where the freshwater carp aspen, which is on the Swedish Red List, goes up to spawn. Interview with Gustav Hellström, fish biologist at the Swedish University of Agricultural Sciences. A research collaboration between SLU, Upplandsstiftelsen and Länsstyrelsen i Uppland.