oligotrophic
Concise Oxford English Dictionary © 2008 Oxford University Press:
oligotrophic /ˌɒlɪgə(ʊ)ˈtrəʊfɪk, -ˈtrɒfɪk/
▶adjective Ecology (of a body of water) relatively poor in plant nutrients and containing abundant oxygen in the deeper parts.
– derivatives
oligotrophy noun.
oligotrophy noun.
'oligotrophic' also found in these Oxford entries:

