Beijing, September 18 (Youth.cn) - Fishermen in Rongcheng, Shandong Province operated holothurian boxes on a marine ranching on September 15th. Rongcheng, the city of "blue granary", constructed 17 aquafarms with the help of local financial support and large marine aquaculture research platform. In the long run, vertical expansion of marine aquaculture to the far sea is planed while ecological, intensive, large-scale, three-dimensional and intelligent fishing industry is expected to promote high-quality development of "blue granary" and to increase efficiency and incomes of the industry. Photo/VCG