Citation:U.P.K. Epa, S.S. de Silva, M.J.S. Wijeyaratne and M. Hettiarachchi. The effectiveness of an organic immune enhancer and vitamin C in zero water exchange Penaeus monodon culture ponds. Paper presented at the Seventh Annual Scientific Sessions of the Sri Lanka Association for Fisheries and Aquatic Resources Colombo, Sri Lanka. 28.06.2001.