Journal article Open Access

Der Huchen stirbt aus – was tun? Gefährdungsfaktoren und notwendige Maßnahmen in Bayern und Österreich

Schmutz S.; Jungwirth M.; Ratschan C.; Siemens M. v.; Guttmann S.; Paintner S.; Unfer G.; Weiss S.; Hanfland S.; Schenekar T.; Schubert M.; Brunner H.; Born O.; Woschitz G.; Gum B.; Friedl T.; Komposch C.; Mühlbauer M.; Honsig-Erlenburg W.; Hackländer K.; Haidvogl G.; Eberstaller J.; Friedrich T.; Geist J.; Gumpinger C.; Graf C.; Hofpointner M.; Honsig-Erlenburg G.; Latzer D.; Pinter K.; Rechberger A.; Schähle Z.; Schotzko N.; Seliger C.; Sutter G.; Schröder W.; Zauner G.

Originally, the Danube salmon (Hucho hucho) occurred in Bavaria and Austria
in more than 250 rivers occupying more than 7,400 km of rivers. Nowadays,
populations in »very good« and »good« status exist in only 0.7 % and 7.1 % of the
original distribution. Therefore, the Danube salmon is classified as an endangered
species. Due to ongoing stock declines the Danube salmon is running
the risk to become a critically endangered species soon. The main reasons for
the declines are river channelization and hydropower development. In addition,
climate change may further contribute to stock declines in lowland river
sections due to exceedance of water temperature limits of this cold-water
species. Furthermore, Danube salmon and prey fish populations have lost
their resilience to cope with re-established populations of fish predators (cormorant,
goosander, fish otter) leading to ongoing population declines. Effective
protection against further degradations such as new hydropower developments
is required to safeguard the Danube salmon remaining populations.
Furthermore, degraded rivers need to be restored and fish predators have to
be managed to allow recovery of Danube salmon and prey fish populations.
Due to the precarious situation conservation and restoration actions have to
be implemented immediately.

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