Cambodia boasts nearly 500 species of freshwater fish. More research on freshwater fish needs to be done on a wider scale because so little is known even about the types of fishes that exist there. In his quest to encounter every fish that exists in Cambodia, Tomoyuki Sato, an avid aquarist, has been cataloguing the freshwater fishes of Cambodia with great zeal. At the same time, the Cambodian arowana conservation project has hired him to study the Asian arowana which has been declared an endangered species. We take a fascinating look at this man, Tomoyuki Sato, and his simple and honest desire to “encounter every fish that exists.”