上海临海的奉贤、金山、南汇三个郊县,地处长江口与钱塘江口交汇地带,属低盐水域,由于南汇所处地理位置,近海盐度远比奉贤、金山还低,七月盐度一般为1.8‰,十月为1‰,常年多数月份为1—2‰,比重计上的读数经常出现1.000,近乎淡水,如此微咸水域能否养对虾较长时间以来人们一直感到疑虑,在迄今为止的养虾资料上尚未见有类似水域饲养中国对虾Penaeus chinensis(Osbeck,1765)成功的事例,就其本县来说,1982年滨海乡也曾试养过此虾,但失败了,今年果园乡也进苗307万尾,并采取虾苗过淡处理和提高虾塘比重措施,因管理不当也以失败告终,于是“南汇不能养对虾”的 Shanghai Linhai Fengxian, Jinshan, Nanhui three suburbs, is located in the mouth of the Yangtze River estuary and the Qiantang River mouth belt, is a low salt water area, due to the geographical location of Nanhui, offshore salinity much lower than Fengxian, Jinshan, July salinity Typically 1.8 ‰, 1 ‰ in October, and 1-2 ‰ in most years of the year, readings on hydrometers often appear at 1.000, which is almost fresh water, so people have been doubting the availability of shrimp in brackish waters for a long time. To date, there have been no successful cases of shrimp Penaeus chinensis (Osbeck, 1765) in similar waters, and for its part, this shrimp was tried and tested in Binhai Township in 1982 but failed this year Orchard Township, also into the seedlings 3070000, and to take too shrimp seedling treatment and measures to increase the proportion of shrimp ponds, due to unsuccessful management also failed, so “Nanhui can not keep shrimp”