P.V.Exp.DB is a gene expression database to Penaeus vannamei species,it covers 7 biological items 53 biological samples, spanning 6 important biological backgrounds and 26 biological conditions including bacterial infection, salinity change, viral infection, ammonia preasure, larval development and molting,provides a comprehensive and high quality gene expression collection of Penaeusvannamei in terms of comparative gene expression in tissues or organs and developmental expression profiles .