The objective of the clam stock assessment survey in the Arcachon lagoon is to estimate the stock of Manila clams over its entire distribution area and to describe its main characteristics based on the monitoring of standardized indicators (proportion of different species, average abundance indices in number and weight per m², total abundance and biomass, fraction of juveniles and spawners, exploitable biomass, etc.). The campaign was co-organized with the CDPMEM33, with financial support from the DLAL FEAMP Bassin d'Arcachon Val de l'Eyre, the Nouvelle-Aquitaine Region, the CDPMEM33 and Ifremer. It took place over 18 days spread over 3 periods (corresponding to 20 trips). The samples were collected from 533 sampling stations distributed over an area of 52 km², with an Hamon grab, using a generalized random tessellation stratified spatially balanced design (GRTS).