In addition to the revitalised stretch, a large aquarium has been built for observing the Chriesbach’s living organisms and processes, and it is continually provided with water from the brook. The aquarium houses some of the fish that can be found in the Chriesbach, though not all of the various species. Pike, for example, would eat the small gudgeon.
Species of fish and crabs
In the Chriesbach there are thirteen different species of fish and, in earlier times, at least, there was one species of crab. The stickleback is a new, invasive species of fish.