Climate change with global warming is not disputed by the vast majority of scientists and the aquatic system is most affected. A global rise in water temperature and acidification of the aquatic environment will continue even if we can significantly reduce the current output of the two most important greenhouse gasses (carbon dioxide and methane). These and other environmental changes will affect fish health which includes infectious pathogens.This important text is the second volume on climate change and fish health. It covers changes to the freshwater ecosystem and their current and expected effects on selected infectious diseases of fish. The book represents contributions by over 50 experts from 18 countries. Comprehensive and thought-provoking, the book details abiotic and biotic environmental changes in temperate and tropical freshwater ecosystems, sequestrations of atmospheric carbon dioxide and effects on infectious diseases (12 microbial and 10 parasitic) in economically important fish in tropical, subtropical and temperate waters.The text is key reading for fish disease scientists, aquatic ecologists, fish health consultants, veterinarians, policy makers and all who are interested in fish health and the environment.