In the tests, we compared hatching result of sterilized winter eggs with that of unsterilized winter eggs. It seems to he that there is no need to sterilize winter eggs before hatching. Some suggestions have been put forward in this paper.
Zoothamnium disease js an ubiquitous disease in the culture of Penaeus orientalis. In this paper, the results of treatment of Zoothamnium disease with potassium permanganate in the laboratory trims are reported. The data showed that potassium permanganate at 5 ppm was found to be effective in removing Zoothamnium from the gill filaments and body surface of Penaeus orientalis.
