Asian sheepshead wrasse

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Asian sheepshead wrasse
20100216 acaworld02.jpg
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Labriformes
Family: Labridae
Genus: Semicossyphus
S. reticulatus
Binomial name
Semicossyphus reticulatus
(Valenciennes, 1839)
  • Cossyphus reticulatus Valenciennes, 1839

The Asian sheepshead wrasse, Semicossyphus reticulatus, is a species of wrasse, one of the largest, native to the western Pacific Ocean, where it is only known from around the Korean Peninsula, China, Japan, and the Ogasawara Islands, where it inhabits rocky reef areas.[2][1] It can reach 100 cm (39 in) in total length and the greatest weight recorded for this species is 14.7 kg (32 lb).[2] This species is valued as a food fish in its native range.[1]

an Asian sheepshead wrasse in captivity
Asian sheepshead wrasse in captivity giving indication of size

The Asian sheepshead wrasse, also known as kobudai in Japan, is a hermaphroditic species, meaning that it has both male and female organs which allows it to change its sex. The species gained media attention when the transformation was caught on camera by the BBC Earth crew while filming in the waters near Sado Island, Japan. In 2017, it was shown on the Blue Planet II episode "One Ocean".[3]

According to Great Big Story, Japanese diver Hiroyuki Arakawa has had a 30-year relationship with a sheepshead wrasse in Japan's Tateyama Bay, where he is the caretaker for an underwater Shinto shrine. He calls the fish, named "Yoriko", by hitting a bell on the underwater shrine.[4]


  1. ^ a b c Cornish, A. (Grouper & Wrasse Specialist Group) (2004). "Semicossyphus reticulatus". IUCN Red List of Threatened Species. 2004: e.T44685A10925239. doi:10.2305/IUCN.UK.2004.RLTS.T44685A10925239.en. Retrieved 30 January 2020. CS1 maint: discouraged parameter (link)
  2. ^ a b Froese, Rainer and Pauly, Daniel, eds. (2013). "Semicossyphus reticulatus" in FishBase. October 2013 version.
  3. ^ Cormier, Zoe (November 29, 2017). "Fish are the sex-switching masters of the animal kingdom". BBC Earth.
  4. ^ Gorenstein, Colin (June 20, 2017). "Scuba Diver Has Been Visiting the Same Fish for 30 Years". Mental Floss.