Okada studied at the Imperial Fisheries Institute (now Tokyo University of Marine Science and Technology).
He was a professor at Tokyo Higher Normal School (now University of Tsukuba), and after World War II he taught at Mie University from 1950, where he was dean of Fisheries.
As a zoologist, has contributed in the field of fish taxonomy, as well as reptiles and amphibians.
[2] Okada's primary work in English was Fishes of Japan, which published in 1955 by Maruzen and subsequently issued in revised editions.
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