According to legend, the reason why Shajing oysters are particularly smooth, bright yellow and fat is because of their unusual breeding methods. About 200 years ago, a wooden boat full of pottery was overturned by a typhoon on the sea near the manhole. All the pottery tribes on board are in the sea. Later, the local people were surprised to find that all the ceramic tiles on the seabed were infested with fat and big oysters. Since then, Shajing people began to use the sea area to raise oysters, and deliberately moved oysters to the "fattening area" with deep sea water and particularly rich bait to "fatten" and then collect oysters. The oysters raised in this way are more plump and tender.

Oysters in manholes encountered an unprecedented crisis in the 1980s. With the rapid development of industry and commerce in Shenzhen, the seawater quality has been greatly polluted, which has dealt a heavy blow to the oyster culture in manhole with high water quality requirements. From the late 1980s to the early 1990s, the then Shenzhen Municipal Government re-planned Baoan District, and almost all oyster farms in the Shajing sea area were "planned" as industrial and commercial land. Almost all of Haotian Shajing moved out of Shenzhen and moved to Taishan, Yangjiang and Chaoshan. Oyster culture is to let oysters lay eggs on attachments and breed oyster eggs; Arranging, moving and dispersing oysters are all "field" management of oysters, such as arranging oysters in a row for growth or moving them to a better place for breeding. , very time-consuming and labor-intensive. Opening oysters means opening oysters and taking out the meat.