CPV code 15235000 designates Preserved fish in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
15235000 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 15230000 (Dried or salted fish; fish in brine; smoked fish).