국내 양식산 대하(Penaeus chinensis)에 있어서의 white spot syndrome virus (WSSV) 감염특성

Characteristics of white spot syndrome virus (WSSV) infected shrimp (Penaeus chinensis)

Since 1993, mass mortality has been caused by viral infection on aquaculturing shrimp, and gave to enormous losses to culturing fishery every year. The causative virus associated with white spot syndrome that showed the white spots on the inside of the carapace resulted in mass mortality to the Asian shrimp industry as well as Korea. This study was performed to reveal the infective features of the causative agent through internal and external observation on infected shrimps. In external signs, showed the symptom that red coloration of appendage, and discoloration of body as well as white spots. In histopathological observation, infected shrimp tissues were identified inclusion bodies as in other shrimp viruses, Baculovirus penaei (BP), baculoviral mid-gut gland necrosis virus (BMNV), Penaeus monodon-type baculovirus (MBV), etc. Also, in some case, the histopathological sign by hepatopancreatic parvovirus (HPV) was identified. Infected shrimp by WSSV has a hematological characteristics as follows. First, the number of shrimp hemocyte was slightly decreased as time goes by viral infection. Second, hemocyte composition in the infected shrimp showed that granular and semi-granular cell was decreased, however, hyaline cell increased. In view of the fact that granular cells play an important role in non-specific defense mechanism for foreign pathogen in shrimp.