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White spot syndrime virus (WSSV) is a highly contagious disease in shrimp culture and causing 100% death within 3-10 days of clinical symptoms. WSSV can infect shrimp in post larvae stage (PL) to a size of 40 g. This study was aimed to determine the effect of different salinity against WSSV infection level in post larvae vannamei shrimp ( Litopenaeus vannamei ). In this study PL 40 size of vannamei shrimp infected with WSSV in virus concentration 20 μg.mL -1 in three different salinity is 5 ppt, 15 ppt, 25 ppt for 4 hours using the soaking method then maintened for 7 days post-infection and then infection level and water quality observed. Data analysis used simple linear regression and F test with a confidence level 95% (P <0.05). The results indicate changes in behavior between healthy and infected shrimp in three levels (mild, moderate, severe). The highest total mild infection in salinity treatment of 25 ppt by 30%, the highest total medium infection at salinity treatment 25 ppt by 37%, the highest total severe infection at salinity treatment 5 ppt by 57%. Shrimp that have mild level of infection are increasing in concominant higher salinity, while the severe infection level has decreases with increasing salinity. Keywords: Infection Level, Litopenaeus vannamei , Post Larvae, Salinity, WSSV

Effect of Maintenance at Different Salinity against White Spot Syndrome Virus (WSSV) Infection Level in Post Larvae Litopenaeus vannamei Shrimp