This project focuses on the risks posed by toxic benthic cyanobacterial blooms. We will study how light and key environmental factors influence their growth and toxin production. Our goal is to create tools to monitor and reduce the impact of these blooms by combining environmental surveillance with experimental studies on benthic species. This approach will allow us to develop a risk assessment and decision-making strategy, including public self-reporting for early warning. We will also explore biological control methods to limit the toxigenic species. A recent bloom in Lake Neuchâtel offers a model for refining these strategies and improving management and mitigation efforts.