Term used to describe the productivity of the lake ecosystem and classify it as oligotrophic (low productivity, "good" water quality), mesotrophic (moderate productivity), or eutrophic (high productivity; "poor" water quality).
The degree of fertility of a lake. Factors used to assess the trophic state of a lake include chlorophyll , dissolved oxygen and phosphorus concentrations. algal biomass, Secchi depth and macrophyte biomass. See also hyper-eutrophic lakes, eutrophic lakes, mesotrophic lakes. oligotrophic lakes, dystrophic lakes.[Gk. trophe, nourishment.