We use inverted microscopy to analyse the composition, concentration and bio-volumes of phytoplankton in UK lake waters.

Analyses are carried out using sedimentation chambers with an inverted microscope following the Uteröhl technique. Bio-volumes are estimated based on numerous measurements of individuals of each taxa. ENSIS regularly takes part in the European Phytoplankton proficiency tests (organised by SKYE, EQAT and CEN), that are designed to harmonise analyses between laboratories and countries