Abstract
Two species of the sea chubs, Kyphosus cinerascens (Forssål) and K.lembus (Cuvier), have hitherto been known from the Japanese waters.Many specimens of the third species of Kyphosus, which is very common in the shore of the Ogasawara Islands (Bonin Islands), were collected from the islands and Minami-tori-shima (Marcus Island) by the training vessels, Seiyomaru and Shinyo-maru, of the Tokyo University of Fisheries from 1968 to 1973.Other two specimens were obtained from the Izu and Ryukyu Islands.The author tentatively identified the present sea chub as K.bigibbus Lacepede on the basis of the following combination of characters:
