Ranchu

The ranchu (scientific name "Carassius auratus") is a hooded variety of fancy goldfish developed in Japan.
Appearance.
Ranchu can reach between 6 and 8 inches(15 to 20 centimeters)with a pale-yellow bodies and bright red heads are rare. Ranchu have a more downturned tail,more-arched backs and have much shorter tails.
Living areas.
Ranchu do not grow naturally any more.
Food and water.
Raw bloodworm and Daphnia.
Threats.
Water pollution and climate change.
Reproduction.
The breeding season is from April through May, and females spawn their eggs after mating with males.
Relationship with humans.
Ranchu are bred by people and often kept as pets.