By Martina P | 8:15 AM UTC, Sat April 07, 2012 Locality Čertovo jezero (lake) Country Czech Republic Year 1986 Temperature (°C) 6.0 pH 4.3 Conductivity (μS/cm) 32 Species Synura echinulata References HARTMANN & STEINBERG (1989) Coordinates 49.164981, 13.197398