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The North Sea houting (Coregonus oxyrinchus) is a whitefish that is endemic to the Wadden Sea, an area including the North Sea coasts of the Netherlands, Germany and Denmark. A critically small population in Denmark’s Vidaa River, estimated at 3,500 adult individuals in 2014, is the last remaining worldwide. We call on the Danish authorities to prevent further decline of this fish through informed conservation planning and management before it is too late.