Using golden carp as the testing fish,LC(50) values of dimethyldiallyammonium chloride(DM) and its homopolymers(PDM) with intrinsic viscosity values of 0.5,1.5 and 2.5 dL/g were tested within an experiment period of 96 h.

• 以锦鲤为受试对象；96 h为实验周期；对DM及特征黏度分别为0.；5、1