Breeders work at a kelp cultivation base in Rongcheng, east China's Shandong Province, Nov. 15, 2018. (Xinhua/Wang Fudong)

　　Aerial photo taken on Nov. 15, 2018 shows breeders working at a kelp cultivation base in Rongcheng, east China's Shandong Province. (Xinhua/Wang Fudong)

　　Aerial photo taken on Nov. 15, 2018 shows breeders working at a kelp cultivation base in Rongcheng, east China's Shandong Province. (Xinhua/Wang Fudong)

　　Breeders work at a kelp cultivation company in Rongcheng, east China's Shandong Province, Nov. 14, 2018. (Xinhua/Wang Fudong)