At an international regatta in Stockholm in June 1965, Nüßner won the K-1 500 m competition.[30] A month later at a regatta in Copenhagen, Nüßner won both the K-1 500 m and 5000 m competitions.[31] At the 1965 Canoe Sprint European Championships on Lake Snagov near Bucharest, Romania, Nüßner came sixth in the K-1 500 m competition.[32] At an international regatta in Prague in September 1965, Nüßner came fifth in the K-1 500 m but won the K-2 500 m teamed up with Helga Ulze.[33]