Japanese Rice fish, or medaka, is a freshwater fish native to Japan. They are small and colorful fish that can thrive in a wide variety of aquatic environments. They are popularly kept as aquarium pets and have been studied extensively for their interesting characteristics.
Japanese Rice fish is an oviparous species and lay their eggs on the wall of ponds and streams. When the eggs hatch, the babies must return to the water to survive.
Although mainly located in Japan, medaka has been introduced to many parts of the world, including Hawaii, Taiwan, and the United States.
This species is known for its high levels of intelligence and its ability to adapt to changing environments. They can even recognize their reflection in a mirror.
Japanese Rice fish are scavengers and feed on zooplankton, worms, and algae in the wild.
When introducing two or more medaka to an aquarium, they should be placed in tanks of no less than 10 gallons with plenty of hiding places.
Japanese Rice fish have been bred in laboratories creating different varieties, including albino, long-fin, and gold.
Medaka typically reach 2-3 inches long and live 2-3 years in the wild.
The males are generally more colorful and have more elaborate fins than the females.
In Japan, medaka are served in sushi as a delicacy.
Japanese Ricefish can secrete a small amount of antifreeze-like substance to survive in cool temperatures.