Environmental time series in the Bay of Brest (Pointe du chateau). Phytoplankton species (optical microscopy) and some enviromental parameters (macronutrients, temperature and salinity) were measured since 2009. This time series was initiated to follow Alexandrium minutum's dynamic in the Bay. Abundances of pico- and nano-phytoplankton are also available for the period on request. Data should be included in futur releases.