1. Laboratory of Microbiology, Department of Seafood Science, National Kaohsiung Marine University, Kaohsiung 811, Taiwan
2. Department of Marine Biotechnology, National Kaohsiung Marine University, Kaohsiung, Taiwan
3. Department of Aquaculture, National Kaohsiung Marine University, Kaohsiung, Taiwan
4. Division of Biology and Ocean Sciences, Inha University, Yonghyun Dong, Incheon 402-751, Republic of Korea