First and foremost this thesis is dealing with the examination and analysis of biotic and non-biotic data taken from the river Danube during the research year 2004. The study areas are situated along the shoreline of the hydro power plant Vienna-Freudenau (finished in 1998). Being just another anthropogenic intervention strongly affecting the river continuum of the river Danube, measures of compensation meaning nine artificial constructed habitats - have been implemented to specifically give Danube fish species structured living space in a monotonous impoundment. To document the ecological impact of those habitats on a fish-ecological basis, and in order to set the right measures of maintenance in the near future, two different sets of data were compiled within the INTERREG III FIDON project: fish-data (biotic data) and non-biotic data (river-temperature, water depth, visual depth, water-conductivity, stream bank substrate distribution for each habitat) have been investigated. Those data were put into the extensive archive of the ACCESS fish data bank. Additionally different statistical analyses were made - first, to get a general overview, Microsoft Excel statistic options have been undertaken, and then, focusing on the ecological meaning of the fish data by proper statistical methods, the computer programme SPSS was used. To show the characteristics of each habitat as well as the differences between and/or the common ground of the river bank structures, the methods of “cluster analysis” and “discriminant analysis” were specifically incorporated and in the following compared - mainly to underpin the results of one method by the other and vice versa.