Data supporting: Development and validation of an environmental DNA assay to detect the threatened European Flat Oyster (Ostrea edulis)

Raw qPCR data supporting the development and validation of a COI-based eDNA assay for Ostrea edulis. Includes environmental sample Cq values, standard curve dilution data (used to estimate LOD and LOQ), cross-amplification specificity testing results, and a README file describing calculations and data structure.