![]() ![]() 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.
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