Advancements and challenges in developing analytical methodologies, not only for existing aquatic biotoxins, but also for emergent toxins as a result of diverse factors related to climate change, are key to the sixth edition of the International Symposium Marine and Freshwater Toxins Analysis. Organized by the Department of Analytical and Alimentary Chemistry of the University of Vigo, the symposium "focuses on analyzing aquatic biotoxins, in marine and freshwater," explains professor and researcher Ana Gago, which is also the director of reference Laboratory of the European Union for merine biotoxins. Close to 90 international experts in analysis of aquatic biotoxins, from the United States, Canada, Xapón, Nova Zelandia, Chile, as well as representatives of member states of the European Union, participate in the international congress that is developed in the Talaso Atlántico of Baiona Hotel.