Sampans loaded with kelp lined up toward the dock in farming sea in Rongcheng, East China's Shandong Province on Wednesday. Rongcheng city is the largest product area of kelp in China, as its aquaculture area and output rank first. The average annual production of kelp accounts for 80 percent of the province's total output and more than 40 percent of the country's total. Photo: cnsphoto