Participants learn about the abiotic conditions of flowing waters and how they change over time. What are the differences between which parts of the stream in regards to temperature, hydrogen content or depth of the water? How is the habitat affected through differences in these factors?

Why do we think of a particular shape when think about fishes? Why do they look like that? To answer this question, the participants work out the different body shapes of our native fish fauna and find out which shape is adapted to which habitat and why.

What does a fish eat? Where do they sleep? In this module, kids learn about different fish species and their habitat requirements in our local streams. To help fish find their preferred habitat in the different stretches of the stream, the participants have to be active - not all the required structures or features can be recognised straight away!

In this module, the participants deal with native crayfish and their ecology. For this purpose, they collect data on the occurrence and number of different crayfish species in the Sulzbach at the Eußerthal research facility. The data are evaluated and discussed together. In addition, the crayfish caught (dummies) are examined for crayfish plague, one of the most relevant causes of endangerment. With the help of the results and background knowledge, the children determine the endangerment potential of our native crayfish. Finally, the participants get to know the physique and movements of the native noble crayfish on real specimens.