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Ricefish
The ricefishes are a family (Adrianichthyidae) of small ray-finned fish that are found in fresh and brackish waters from India to Japan and out into the Indo-Australian Archipelago, most notably Sulawesi. The common name of the group derives from the fact that many species are found in Japanese rice paddies.〔 This family consists of about 32 species, some extremely rare and endangered, and some 2-4 may already be extinct.〔http://www.redorbit.com/education/reference_library/science_1/fish/2578402/ricefish/〕
==Description==
Most of these species are quite small, making them of interest for aquaria. The largest species, the buntingi, can reach in length, but most are less than a fifth this length, with the smallest being only long. They have a number of distinctive features, including an unusual structure to the jaw, and the presence of an additional bone in the tail.
The medaka, ''Oryzias latipes'', is a popular model organism used in research in developmental biology. Ricefish have traveled into space, where they have the distinction of being the first vertebrate to mate and produce healthy young in space.〔http://www.tfhmagazine.com/details/articles/the-ricefish-an-odd-and-interesting-group-full-article.htm〕
Genetic study of the family suggests that it originally evolved on Sulawesi and spread from there to the Asian mainland; the supposed genus ''Xenopoecilus'' are apparently unrelated, morphologically divergent species of ''Oryzias''.〔Takehana ''et al.'', 2005〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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