In recent years, Hushan town in Rongcheng, Shandong province has optimized its industrial structure, and encouraged local farmers to breed koi, which has greatly increased farmers' incomes.

A koi fish farm in Hushan town. Koi fish are kept for decorative purposes in outdoor koi ponds or water gardens. [Photo/IC]

A farmer holds a golden koi, which represents luck and fortune in Chinese culture. [Photo/IC]

Koi are an ornamental species of fish that descend from carp. [Photo/IC]

Farmers feed koi at a breeding base in Hushan town. [Photo/IC]

Breeding koi has increased local farmers' incomes in Hushan town. [Photo/IC]

Koi are famous for their beauty and a symbol of good fortune in China. [Photo/IC]