Caohai Lake is the largest natural lake in Guizhou Province. In accordance with relevant standards and guidelines

this study evaluates 17 indicators in 4 categories selected for the health assessment of Caohai Lake. The scores for basin condition

water condition

biota

and social services are 91. 1

70. 2

65. 3

and 94. 0

respectively

resulting in a weighted overall score of 80. 5 and a health classification of healthy. Nevertheless

considerable scope for improvement remains in several indicators

including variation in lake inflow

water quality

trophic status

phytoplankton density

and aquatic macrophyte coverage. Based on the assessment results

recommended measures include integrated urban-rural environmental management around Caohai Lake

control of internal pollution loads

further research on biodiversity

studies of water replenishment projects

pilot mechanisms integrating lake protection and operation

and a quantitative reward-and-penalty mechanism for lake protection. These measures are intended to improve the aquatic environment and contribute to the conservation of Caohai Lake

which is the “Pearl of the Plateau” in Guizhou Province.