A public librarian was asked who discovered the zebra fish. Searching the Encyclopedia of Life, the librarian saw "Hamilton, 1822" associated with the zebra fish species name. Wondering who Hamilton was, the librarian searched WorldCat and learned it was Francis Hamilton, who published a book in 1822 describing fish found in the Ganges river. Clicking the Biodiversity Heritage Library link on the EOL page, the librarian found a link to one of Hamilton's books from 1878 containing an image and description of the zebra fish, answering the original question.