This SRN dataset includes long-term time series on marine phytoplankton and physico-chemical measures, since 1992, along the eastern English Channel coast. More precisely, samples were collected  along transects offshore Dunkerque, Boulogne-sur-Mer and the bay of Somme. Data are complementary to REPHY and REPHYTOX datasets. Phytoplankton data essentially cover microscopic taxonomic identifications and counts, but also pigments measures (Chlorophyll-a and pheopigment). Physico-chemical measures include temperature, salinity, turbidity, suspended matters (organic, mineral), dissolved oxygen, dissolved inorganic nutrients (ammonium, nitrite+nitrate, phosphate, silicate).