Oryzias curvinotus, or the Hainan medaka, is a species of ricefish which is found in Quang Ninh Province in northern Vietnam and Hainan, Guangdong and Hong Kong in southern China.

[1] It is found in both fresh and brackish water.

Pope with the type locality given as Nodoa, Hainan Island, China.

[4] Oryzias curvinotus can grow to 4 cm (1.6 in) total length.

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