![]() ![]() The taxonomic position of certain populations, including some in China, Laos and east Korea, is unclear and require further study. sinensis (Chinese rice fish) in much of China, west Korea and parts of mainland southeast Asia. sakaizumii in northwestern Honshu in Japan (locally, it hybridizes with O. Formerly included in this species but now regarded as separate are O. latipes to Japan: eastern and southern Honshu, Shikoku, Kyushu, and smaller southern islands in the country. This limits the native range of definite O. latipes was native to much of east and mainland southeast Asia, but in recent decades most of these populations have been split off as separate species based on morphological ( morphometrics and meristics) and genetic evidence. Taxonomy and range Ī group in a shallow ditch, a typical habitat of the species ( Katori, Japan)Īs originally defined, O. They live in schools, and they can recognize the faces of other individual medaka. The average life span of this species in the wild is estimated to be 2 years, though in laboratory conditions they can survive 3–5 years. They have an advanced renal function, which enables them to live in saltwater and brackish water. The egg usually requires 4–10 days to hatch. They prefer to lay eggs around water grass and often prefer living in rice fields. They are seasonal breeding animals and usually lay eggs between spring and summer. They produce 10-20 eggs per birth, and they can produce eggs every day in laboratory conditions. Since they eat juvenile mosquitoes and small plankton, they are known as a beneficial organism for humans. ![]() They can survive in a wide range of water temperatures (3–42 ☌ or 37–108 ☏), but they prefer a water temperature of 15–28 ☌ (59–82 ☏). Medaka live in small ponds, shallow rivers, and rice fields. 2.1 Origin of Southern and Northern Japanese populations.After fertilization, the female carries her eggs attached anterior to the anal fin for a period before depositing them on plants or similar things. The medaka has been a popular pet since the 17th century in Japan. Bright yellow, red or green transgenic populations, similar to GloFish, have also been developed, but are banned from sale in the EU. It became popular as an aquarium fish because of its hardiness and pleasant coloration: its coloration varies from creamy-white to yellowish in the wild to white, creamy-yellow, or orange in aquarium-bred individuals. It is euryhaline, occurring in both brackish and freshwater. This small (up to about 3.6 cm or 1.4 in) native of East Asia is a denizen of rice paddies, marshes, ponds, slow-moving streams and tide pools. The Japanese rice fish ( Oryzias latipes), also known as the medaka, is a member of genus Oryzias ( ricefish), the only genus in the subfamily Oryziinae. Aplocheilus latipes (Temminck & Schlegel, 1846).Poecilia latipes Temminck & Schlegel, 1846.
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