chanos (Forsskal) to formalin-killed Vibrio vulnificus I.S. Azad*, J. Syama Dayal, M. Poornima, S.A. Ali Central Institute of Brackishwater Aquaculture, 75 Santhome High Road, R.A. Puram, Chennai 600028, India Received 26 May 2006; revised 16 September 2006;