ROCCH dataset : chemical contaminants levels for shellfish area quality management

Rocch, the french "mussel watch", provides regulatory data for shellfish area quality management. Once a year, molluscs (mainly mussels and oysters) were sampled at fixed periods (currently mid-February, with a tolerance of one tide before and after the target date) on 70 to 80  monitoring stations in areas used as bivalve molluscs production. For each monitoring station, molluscs are collected in wild beds or facilities, ensuring a minimum stay of 6 months on-site before sampling. The individuals selected are adults of a single species and uniform size (30 to 60 mm long for mussels, 2 to 3 years old for oysters, and commercial size for other species). A minimum of 50 mussels (and other species of similar size) or 10 oysters is required to constitute a representative pooled sample. Lead, mercury, cadmium, PAHs, PCBs, dioxins and, since 2023, regulated PFASs are analysed in molluscs tissues.


Environment, Fisheries and aquaculture


chemical contaminants, molluscs, quality, shellfish area


51.16895N, 41.594832S, 9.667969E, -5.361328W


Alternative access to data

2020 data
692 KoCSVQuality controlled data
2021 data
578 KoCSVQuality controlled data
2022 data
340 KoCSVQuality controlled data
2023 data
504 KoCSVQuality controlled data
How to cite
Grouhel-Pellouin Anne, Verin Francoise, Maheux Frank, Le Gall Patrik, Cheve Julien, Lebrun Luc, Gabellec Raoul, Schmitt Anne, Bruneau Audrey, Le Fur Ines, Gouriou Laure, Rigouin Loic, Munaron Dominique, Gianaroli Camille, Serais Ophelie, Marco-Miralles Francoise, Connes Coralie, Brodu Nicolas, Lebon Fabien, Malo Florent, Costes Louis, Benhamou Jeremy (2024). ROCCH dataset : chemical contaminants levels for shellfish area quality management. SEANOE.

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