Recolonization of Danube Salmon (Hucho hucho) in the lower section of the river Traisen with special emphasis on natural reproduction and homing behavior.

The Danube Salmon (Hucho hucho) is an endemic species of the Danube river-system. The species is highly endangered and at risk of extinction. Due to its distinct habitat requirements it is an excelent indicator and umbrella species, respectively. During the ongoing EU-LIFE+ Project the lower section of the river Traisen was restored and therefore provides new suitable habitat for the Danube Salmon. This resembles the basis for successful recolonization of the Danube Salmon. The Project aims at: (1) Initianiting an adequate Danube Salmon population by stocking Danube Salmon eggs and juveniles. (2) Investigating habitat choice and homing behavior of the Danube Salmon. (3) Comparing the egg-stocking-method with the stocking of juveniles and evaluating the success. (4) Deriving strategies for a sound management of the Danube Salmon which can be transfered to other water bodies.