Abstract
The red leg disease of the prawn (Penaeus orientalis Kishinouye) is a new kind of disease which occurred and prevailed in many maricuiture farm in East China in recent years. The article reports the pathological changes in the microstructure of some tissues from the diseased prawn, which are studied by light microscopy (LM) and transmission electron micros copy(TEM). The result shows that small number of bacteria exist in the haemolymph of the diseased prawn and that the number of haemocytes decreases obviously. Lots of tree-like or radiation-like orange-red pigment granules are seen int the derma layer of the shell of the swimming feet by LM. In the ultrathin section of the swimming feet many parasitic bacteria can be observed assembling or scattering in the cytoplasm as well as in the cytoplasm of midgut, heart and gill fillarnents(Fig 4-6). Its proved that the bacteria separated from the haemlymph of the diseased prawn are the pathogen of the red leg disease known as Vibrio angullarum through the tests of the manual infection and bacteriological identifications. Its a short bacillus without germ, but with a single-ended flagella which has sheath.
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