Golden mandarin fish
The golden mandarin fish (Siniperca scherzeri), also known as the leopard mandarin fish, is a species of freshwater ray-finned fish, an Asian perch from the family Sinipercidae, which is native to eastern Asia (Korea, China, and Vietnam). This species can reach at least  in standard length and  in weight. It is typically yellowish-brown with blackish-brown speckles ("leopard"), but there are also bright yellow ("golden") individuals, which are particularly prized in Korea and selectively bred in captivity.

It is a commercially important fish, but has declined due to overfishing and habitat loss. It is farmed; typically using pure specimens, but sometimes involving hybrids with the faster-growing mandarin fish (Siniperca chuatsi). Danyang County, North Chungcheong Province organizes a fishing festival for golden mandarin fish every April.

References

Siniperca
Fish of Asia
Fish of China
Fish of Korea
Taxa named by Franz Steindachner
Fish described in 1892