Gephyroberyx japonicus, the big roughy or blueberry roughy, is a species of fish in the family Trachichthyidae. It is endemic to the northwest Pacific off Japan, Taiwan and Hawaii,Shen, S.C. (1993). Fishes of Taiwan. Department of Zoology, National Taiwan University, TaipeiMundy, B.C. (2005). Checklist of Fishes of the Hawaiian Archipelago. Bishop Museum, Bulletins of Zoology. and can be found at depths between .JAMSTEC 2000 Annual Report (2000). Japan Marine Science & Technology Center, Yokosuka, Japan. It can reach in length.Oka, S.I., and Higashiji, T. (2012). Early ontogeny of big roughy Gephyroberyx japonicus (Beryciformes: Trachichthyidae) in captivity. Ichthyol. Res. 59: 282-285 Based on broadly overlapping morphological features it is sometimes (e.g., by IUCN) considered a synonym of G. darwinii.Kim, B.J., Go, Y.B., and Imamura, H. (2004). First record of the Trachichthyid Fish, Gephyroberyx darwinii (Teleostei: Beryciformes) from Korea. Korean J. Ichthyol. 16(1): 9-12.
It is sometimes seen in deep-sea exhibits in public aquariums and it has spawned in captivity.
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