The papers in this volume have been grouped according to the main sub-themes of the congress and primarily deal with the biodiversity issues of invasive crustacea, ecology and behaviour and fisheries and aquaculture.

This volume, 9B, covers the infraorders of the Astacidea that were not covered in volume 9A (Enoplometopoidea, Nephropoidea and Glypheidea) as well as the Axiidea, Gebiidea and Anomura. With the publication of this ninth volume in the Treatise on Zoology: The Crustacea, we depart from the sequence one would normally expect. Some crustacean groups never had a French version produced, namely, the orders Stomatopoda, Euphausiacea, Amphionidacea, and Decapoda; the largest contingent of these involved Decapoda - a group of tremendous diversity and for which we have great depth of knowledge....