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Marine and freshwater biology covers the aquatic sciences, which may include topics like marine ecology and environmental research, aquatic biology, marine pollution and toxicology, aquatic botany and plant management, and molluscan and shellfish research. These are the world's top universities for marine and freshwater biology.
https://www.usnews.com/education/best-global-universities/marine-freshwater-biology
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Ocean University of China
University of Tasmania
East China Normal University
James Cook University
University of Washington Seattle
University of Western Australia
University of Chinese Academy of Sciences, CAS
Sorbonne Universite
Universidade do Porto
Aarhus University
Shanghai Ocean University
Dalhousie University