Poecilia latipes Temminck and Schlegel, 1846, Japan.
OTHER COMMON NAMES
English: Japanese medaka, tooth-carp; German: Japan- Reiskдrpfling; Cantonese: Fut mei dzeung ue; Japanese: Medaka.
Maximum length 1.6 in (4 cm). Small and shallow bodied, with upturned mouth and silvery olive coloration. No spines in dorsal or anal fins. Many strains of captive-raised Japanese rice fish have been selectively bred for pale yellow color. Strains that appear red or mottled black and gold have also been developed.
Japan, Korea, China, and Vietnam, as well as the great rivers of Southeast Asia: the Mekong, Red, Irrawaddy, and Salween.
Calm stretches of streams, rice paddies, and wetlands.
Forms schools, generally peaceful.
FEEDING ECOLOGY AND DIET
Feeds on zooplankton and insects, as well as some detritus and plant material.
Fertilization is external, although the eggs are carried for a short time, stuck to the female’s abdomen, prior to deposition. Females can produce broods of 10–40 eggs every two days during the breeding season. Eggs are slightly larger than 0.039 in (1 mm) in diameter and usually hatch in 8–14 days.
SIGNIFICANCE TO HUMANS
Used widely in experimental research, also found in the aquarium trade.
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