Abstract

In a previous paper (1981), this author indicated that the most characteristic cytological change of this disease producing high mortality of kuruma shrimp larvae (P. japonicus)and postlarvae was hypertrophied nuclei resulting in chromatolysis of the affected mid-gut gland epithelial cells. In the present study, the author examined this epizootic by detecting hypertrophied nuclei in squash and stained preparations of the affected mid-gut gland, or in squash unstained preparations under central illumination, dark field illumination, phase contrast and interference microscope.