Figure 1. Biological zones in a lake

From

The Use of an Aeration System to Prevent Thermal Stratification of Water Bodies: Pond, Lake and Water Supply Reservoir

Md. Saidul Azam Chowdhury, Khairul Hasan, Kaosar Alam

Applied Ecology and Environmental Sciences. 2014, 2(1), 1-7 doi:10.12691/aees-2-1-1