The Unintended Consequences of Otters Saving the Ecosystem

On this river, there are fat and happy otters who are unintentionally helping to protect the ecosystem by stopping non-native fish from causing damage. However, this is not a happy story for the confused fish that are released and immediately become prey. There is a German word for this situation, 'verchlimbezlerum', which refers to an attempted improvement that makes things worse.