Trophic State Index (TSI)

The Trophic State Index (TSI) is a measure used to assess the productivity or nutrient richness of a water body, such as a lake or pond. It evaluates factors like algae growth, clarity, and nutrient levels (primarily phosphorus and nitrogen). A low TSI indicates oligotrophic water, which is clear and nutrient-poor, while a high TSI suggests eutrophic conditions, characterized by heavy algae growth and potential oxygen depletion. The TSI helps identify the ecological health and suitability for recreation or aquatic life, guiding management practices to prevent issues like algal blooms and maintain balanced aquatic ecosystems.