Correlation between growth rate of prawn in body weight and Ca~(2+) and Mg~(2+) in alkaline waters to the Songnen Plain in China;

In order to research the techniques of prawn culture in alkaline waters,it\'s needed to study the relativity between the survival and growth of prawn and the mass concentration of K+,Ca2+ and Mg2+,Na+/K+ and M/D ratio(ionic coefficient) in alkaline water environment,by means of growth test of Litopenaeus vannamei with the water of saline-alkali lake and pond.

To understand the feasibility of transplanting prawn in carbonate saline-alkali waters,acute toxicity of the alkalinity to desalination larval Penaeus vannamei was determined in wild by one-way toxicity test,and to survey the live ability of desalination larval P.

In order to set up the technical system of transplanting and taming prawn into alkaline waters in northeast China,to make growth experiment of juvenile Litopenaeus vannamei by way of semi-saltwater from prawn pond and the water of alkaline lake,researching the relativity between the growth of juvenile shrimp and 10 kinds of environmental factors.

For the sake of understanding the possibility of transplanting Penaeus vannamei in carbonate saline-alkaline waters of the Songnen Plain, northeast China, ability to desalination juvenile on pH was investigated in natural saline-alkaline water and acute toxicity test at water temperatures(24.