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.

ROCCH项目，即法国的‘贻贝监控系统’，为贝类区域质量管理提供监管数据。每年，在70至80个用于双壳贝类养殖区域的监测站上，于固定时间段（目前为二月中旬，目标日期前后各容忍一个潮汐周期）对贝类（主要是贻贝和牡蛎）进行采样。在每个监测站，贝类均从野生床或设施中收集，确保在采样前现场停留至少6个月。所选个体为单一物种的成年个体，且尺寸统一（贻贝长度为30至60毫米，牡蛎为2至3岁，其他物种为商业尺寸）。构成具有代表性的混合样品，至少需要50个贻贝（及其他类似尺寸的物种）或10个牡蛎。对贝类组织中的铅、汞、镉、多环芳烃、多氯联苯、二恶英以及自2023年起，受监管的全氟和多氟化合物进行分析。