Results to the Ecology of Endangered Species of Fish and Cyclostomes from Three Streams of Northern and Central Germany

Research into endangered species of fish and cyclostomes, as well as their living environment, are prerequisite to determining species protection measures. Relevant ecological research was carried out in three streams in the trout and grayling region; the environmental conditions were recorded, and the populations characterised. Consequently the following suggestions for the protection of the streams dealt with in this research can be made.