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The ricefish were formerly classified within the order Cyprinodontiformes but in the 1980s workers showed that they were a monophyletic grouping, mainly based on the characters on the bones of the gill arches and the hyoid apparatus, within the Beloniformes as the family Adrianichthyidae, this family making up one of the three suborders of the Beloniformes, the Adrianichthyoidei.
The Japanese rice fish (Oryzias latipes), also known as the medaka, [2] is a member of genus Oryzias , the only genus in the subfamily Oryziinae. This small (up to about 3.6 cm or 1.4 in) native of Japan is a denizen of rice paddies , marshes, ponds, slow-moving streams and tide pools .
A rice-fish system is a rice polyculture, a practice that integrates rice agriculture with aquaculture, most commonly with freshwater fish. It is based on a mutually beneficial relationship between rice and fish in the same agroecosystem .
Some species are widespread and the Japanese rice fish (O. latipes) is commonly used in science as a model organism, while others have very small ranges and are threatened. [4] They are small, up to 8 cm (3.1 in) long, and most are relatively plain in colour. [5] The genus name Oryzias is a reference to the scientific name for rice, Oryza. [4]
The Chinese rice fish (Oryzias sinensis) is a species of fish in the genus Oryzias. This freshwater fish occurs in swamps, stagnant parts of streams, rice fields and marshes, and is up to 3.1 cm (1.2 in) long. [ 2 ]
Adrianichthys kruyti (the duck-billed buntingi or duckbilled buntingi) is a critically endangered species of ricefish that is endemic to Lake Poso, Sulawesi, Indonesia. [1] [2] It was discovered by Max Wilhelm Carl Weber on his Siboga Expedition to Indonesia. [3]
Oryzias dancena or the Indian ricefish are a freshwater–brackish fish species native to the India, Bangladesh, Sri Lanka, Myanmar and Thailand. Their maximum length is only 3.1 centimetres (1.2 in). They are normally found in brackish habitats near the coast, but it lives in fresh water as well. [2] [1] It is not considered threatened. [1]
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. [ 3 ]