In order to allow you to benefit from all the features of the World of Crayfish platform, we need to know your interest in this type of data. Please mention if you are a scientist (student or advanced), if you are passionate about nature or any other reason. If you are a scientist, please share your identifier for one of the dedicated science platforms: Web of Science, Google Scholar etc. Also, please specify if you are a member of the International Association of Astacology (with paid membership fee).