![](http://www.ecns.cn/hd/2021/08/19/dbad382e6a3f46cbb57a16f6d499743e.jpg)
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.
![](http://www.ecns.cn/hd/2021/08/19/ba57e14a983a4410a8ee623a28b2131e.jpg)
Sampans filled with gracilaria stop at the dock in the coastal mariculture zone in Rongcheng city, east China's Shandong Province. (Photo: China News Service/Li Xinjun)
![](http://www.ecns.cn/hd/2021/08/19/7e7e67098c2a44c08fa9ac4ac6537e76.jpg)
Workers sort out gracilaria in the coastal mariculture zone in Rongcheng city, east China's Shandong Province. (Photo: China News Service/Li Xinjun)
![](http://www.ecns.cn/hd/2021/08/19/4eb6beadbd944d51b470a848374e842e.jpg)
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)
![](http://www.ecns.cn/hd/2021/08/19/631f4e9d020345379374f6a40edc4080.jpg)
Workers carry gracilaria to the land in the coastal mariculture zone in Rongcheng city, east China's Shandong Province. (Photo: China News Service/Li Xinjun)