What is the main difference between oligotrophic and eutrophic lakes?

Oligotrophic lake:

Oligotrophic lakes are lakes that consist of clear water and are less productive.

Eutrophic lake:

Eutrophic lakes are lakes that consist of darker water and are considered to be highly productive.

Oligotrophic lake	Eutrophic lakes
In addition to fewer nutrients, it also contains fewer phosphates and nitrates	The nutrient content is high with a higher concentration of phosphates and nitrates.
These types of lakes contain a lesser amount of biological oxygen demand.	These types of lakes contain a high demand for biological oxygen.
As the water is clear, the penetration of sunlight is quite high.	The water is dark and penetration of sunlight is difficult.
It consists of low chlorophyll and no odor of water is observed.	It consists of a higher amount of chlorophyll and odor is observed due to a higher decomposition rate.
The eutrophication process in this type of lake is minimal.	The eutrophication process in eutrophic lake is considerably high.