oligo = few or little
troph = nourishment
ic = adjective form
oligotrophic = little nourishment (having little phytoplankton or algae)
meso = middle
troph = nourishment
ic = adjective form
mesotrophic = average nourishment (having average phytoplankton or algae)
eu = good
troph = nourishment
ic = adjective form
eutrophic = good nourishment (having lots of phytoplankton or algae)