Abstract: Grass carps' Hemorrhage is the grass carp from grass carp reovirus arising from the epidemic-and high mortality， the danger of virus diseases of aquatic animals， and the results are often caused by large quantities of grass carp fish or fish into the Each year in late June to mid-September Hemorrhage of grass carp is the main epidemic season， the water temperature at 25 ~ 28 Degree Celsius above the most popular ，From Augest to September for the popular peak， the mortality rate sometimes as high as 80 The following three types: First， muscle-red， the red-covered fin red gills， and the third is- These three types of symptoms， can not be completely separated from many of the three symptoms at the same time， mixed
