Sections of a Research Project 108 02 085/01 ; Joint Final Report of the Projects "Mapping of the Occurrence of Fish and Decapod Crustaceans in Shallow Tidal Creeks in the Schleswig-Holstein Wadden Sea" ; "Comprehensive Spot Sampling of Relative Frequencies of Fish and Decapod Crustaceans in the Wadden Sea" ; " Shrimp Fisheries and Nature Conservation in the National Park Wadden Sea of Schleswig-Holstein"