 In 1921 he suggested the establishment of an international association of limnologists to a visiting German colleague, August Thienemann.The following year, on Thursday, August 3, 1922, Naumann and Theinemann co-founded the Societas Internationalis Limnologiae at a meeting held in the auditorium of the Zoological Institute of Kiel University, Germany.Naumann is also widely known for his contributions to lake typology, and specifically for introducing the terms oligotrophic, eutrophic and dystrophic lake to our modern lake classification.