**3.2 Eutrophication**

The term "eutrophic" originates from the Greek word "Eutrophos," meaning "good formation" and "proper union." Similarly, the term "eutrophication" is derived from the Latin words "affectus," meaning "good," and "nutrimens," meaning "food." In Greek, "trophi" means food, and this term is usually accompanied by prefixes such as "oligo," "meso," "eu," and "hyper," which mean "rare, little," "moderate," "abundant," and "severe, high," respectively. Therefore, the words "oligotrophic," "mesotrophic," "eutrophic," and "hypertrophic" are used to express the different states of nutrient levels in lakes or freshwater environments.

There are several definitions of eutrophication, and some of these definitions have fundamental differences from others. One of the differences is related to whether this phenomenon is simply a mechanism for increasing nutrients or if it should also include issues related to enrichment [60–62].

