Medium to grow most phytoplankton species in small eukaryotes (Mamiellophyceae, Pelagophyceae etc...).When using for diatoms and coccolithophorids add silica (Si).ReferenceKeller, M.D., Selvin, R.C., Claus, W. & Guillard, R.R.L. 1987. Media for the culture of oceanic ultraphytoplankton. J. Phycol. 23:633–8.