[The relation of aerogenic to anaerogenic aeromonads of the "Hydrophila-Punctata-group" in river water depending on the load of waste (author's transl)].

The analysis of the relation of the aerogenic and anaerogenic Aeromonas-Species of the "Hydrophila-Punctata-Group" in moving waters of a varying load of waste demonstrates that in the sewage water the anaerogenic subspecies A.hydrophila subsp. anaerogenes and A.punctata subsp. caviae predominate over the aerogenic species A.hydrophila and A.punctata with an average of 78%. Polysaprobic rivers and brooks show a similar relation. To the contrary, the aerogenic Aeromonads-mainly A.hydrophila-dominate over the anaerogenic Aeromonads in oligosaprobic brooks with a low range of variation of the individual value with 90% on the average. The alpha- and beta-mesosaprobic rivers show-with a great variation of the values indicated at each test place-a relation of aerogenic to anaerogenic Aeromonads of 39:61 for the alpha-mesosaprobics and 43:57 for the beta-mesosaprobics on an average; consequently, they are close to each other in average analysis. The great differences in the individual value of both groups seem, however, to make it possible that the determination of the relation of the aerogenic Aeromonads to the anerogenic could show a more sensitive system of waste contamination or of waste load than the saprobic system used in comparison. Since the anaerogenic subspecies A.hydrophila subsp. anerogenes and A.punctata subsp. caviae are very similar to each other from the ecological point of view and A.hydrophila of the aerogenic species is the widely predominating microorganism it seems to be sufficient for practical purpose to determine the relation of aerogenic to anaerogenic Aeromonads of the "Hydrophila-Punctata-Group"; a further differentiation does not assist in obtaining more information at the present time.