To whom correspondence should be addressed.Luo Peng, born in 1977. He received his Ph. D degrees from South China Sea Institute of Oceanology, Chinese Academy of Sciences, in 2006. He also received his B.S. degrees from Huazhong Agriculture University in 2000. His research interests include marine microbiology (bacteria and viruses) and aquaculture. E-mail:cqhu@sciso.an.cn