Fish kill events occur when water quality deteriorates and ecosystem health suffers, and has devastating effects on wildlife, communities, and economies. Causes can include: red tide, water contaminated with chemicals like pesticides and herbicides, biotoxins like harmful algal blooms, diseases, and warming temperatures causing lower concentrations of dissolved oxygen. eFishKill is working to track fish kill events in real-time on a global scale to capture broad trends and provide data and analytics to seed new questions, investigations, and discoveries.