Sampans filled with gracilaria sail to the dock in the coastal mariculture zone in Rongcheng city, east China's Shandong Province. (Photo: China News Service/Li Xinjun)

Workers are busy harvesting gracilaria, a genus of red algae, in a coastal mariculture zone in Rongcheng city, east China's Shandong Province. (Photo: China News Service/Li Xinjun) In recent years, workers in Rongcheng, Shandong Province have used kelp shelves to breed gracilaria according to the growth pattern of mariculture crops.

Workers sort out gracilaria in the coastal mariculture zone in Rongcheng city, east China's Shandong Province. (Photo: China News Service/Li Xinjun)