Overview
- Rostock authorities warned Monday that an algal mat believed to be cyanobacteria was sighted in the Baltic Sea west of Warnemünde and advised people to avoid bathing and skin contact in beach sections 30 to 36.
- The warning names the exact stretch from Neuer Friedhof Warnemünde westward toward Kühlungsborn and stresses extra caution for children and dogs because they face higher risk from contact or drinking contaminated water.
- Officials and scientists note that so-called blue‑green algae are actually bacteria that form surface mats in warm, nutrient‑rich summer water and that dense mats can raise toxin levels that irritate skin and cause stomach symptoms if swallowed.
- Authorities say laboratory testing to confirm toxin concentrations is ongoing and that wind and currents can quickly move, concentrate or disperse the mats, changing which shoreline areas are affected.
- The advisory follows similar Baltic warnings in Poland and fits a seasonal pattern experts link to summer conditions; scientists also warn that when cyanobacterial blooms die off they can fuel growth of Vibrio bacteria, which poses a separate health threat to vulnerable people.