PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Algal water sample. Researcher draining water from a sampling device into a sample jar. The water sample will be tested for the presence of algae. Some algae produce harmful toxins that can poison humans if seafood, fish or water supplies are contaminated. Effects range from diarrhoea to paralysis by neurotoxins. Photographed in Croisic, France.
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