Swimway Oude Ijssel is a 5-year project studying the migration and habitat-use of several fishspecies in the river Oude IJssel. The study area ranges from the Aa-strang in Germany to the mouth of the Oude IJssel at Doesburg in the Netherlands. The research focusses on the following species: River lamprey (Lampetra fluviatilis), silver eel (Anguilla anguilla), Ide (Leuciscus idus), Asp (Aspius aspius), and European catfish (Siluris glanis)