In order to quickly reach natural population levels in newly revitalised shallow bodies of water inhabited by fish, the river or stream must be shadowed.

By installing secured layers of brushwood able to sprout roots as well as fascines, which survive the first flood and sprout and take root, it is possible to create natural shading within two years. Within about ten years, shading develops to a point where it becomes as good as impenetrable, keeps away predators that hunt fish, forms a noise protection wall and maintains water quality.