Beijing, April 15 (Youth.cn) - Boats shuttle back and forth to pick kelp to serve the market in a marine ranching in Weihai City, Shandong Province. Busy scene can be seen in this marine ranching where the breeding area has reached 163,000 mu and annual kelp output has reached 1.75 million tons. As the temperature is suitable for the growth of kelp, this year it enters into market earlier than average year. Photo/CFP