Summary Trophic state index is a measure of how eutrophic conditions are in a water-body. Excess algal growth can indicate eutrophic conditions and is the basis of the index. General Information What is it? This indicator was developed primarily for lakes, but can be used for embayed waters, and is a measure of micro-algal growth. The higher the value, the higher the concentration of algal cells, which can indicate eutrophic conditions.
