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I am not 100 sure about this one! What was the altitude of your spotting. Obviously you didn't find it in the middle of the lake as indicated as location ;-)... You have to verify and try to find an english name...
http://rips-dienste.lubw.baden-wuerttemb...
http://de.wikipedia.org/wiki/Alpen-Strau...
http://observado.org/soort/photos/106287...