TSI can be calculated from the Secchi disk, Chla or total phosphorus results and requires at least five months of data per year. Lakes with TSI values greater than 65 may support algal blooms while values over 100 indicate extreme productivity and annual algae blooms. TSI values can be used to compare lakes with similar water color and track water quality trends within a lake. Turnover is a thorough mixing of stratified layers of lake water, usually in the spring and fall, when temperatures become uniform throughout the lake. Species of fish that do not require deep cool waters of lakes to survive summer heat.
Examples are bass, perch, pike, and pickerel.
These species are often found in mesotrophic and eutrophic lakes in Maine. Zooplankton are floating or weakly mobile microscopic or barely visible aquatic animals that eat algae.