The Biomonitoring and Ecotoxicology Laboratory (BIOTOX) at the Faculty of Sciences, University of Lisbon, is dedicated to advancing knowledge on how environmental stressors shape aquatic ecosystems. Our mission bridges fundamental research with applied solutions, combining expertise in environmental biochemistry, toxicology, nanotoxicology, food chemistry, ecosystem restoration and climate change biology. We are at the forefront of developing biomarkers, biosensors, and innovative tools to assess the impact of contaminants and safeguard ecosystem and food quality. Beyond research, BIOTOX provides trusted analytical and advisory services to the community, from trace element analysis and ecotoxicity assays to environmental impact evaluations. As an integral part of advanced academic training, we mentor Master’s and PhD students, fostering the next generation of scientists while building strong international collaborations. With a proven track record of high-impact publications, funded projects, and active outreach, BIOTOX stands as a dynamic hub where science meets society for healthier oceans and sustainable futures.