In the first half of the twentieth century, full-time fishing was abandoned. High levels of water pollution, the canalisation of the Wiese and the construction of un-bypassable power stations on the Rhine destroyed the habitat and the migration routes of many aquatic animals and thus the economic basis of fishing. Today only the old fishermen's family of Bürgin in Kleinhüningen still has the old fishery licence, and in Haagen the golden fish in their coat of arms recalls the former privilege allowing the Rötteln royal fishing rights to be exercised.