From Coastal Wiki
Definition of Eutrophic:
Rich in nutrients, very productive in terms of aquatic animal and plant life and showing increasing signs of water quality problems.
This is the common definition for Eutrophic, other definitions can be discussed in the article
Walmsley RD, 2000. A Review and Discussion Document. Perspectives on Eutrophication of Surface Waters: Policy/Research Needs in South Africa. Water Research Commission. Project K8/360.