Abstract: A mode of using photosynthetic bacteria and Bacillus for rearing Coelomatra antiquate larvae under no water exchange was studied. The experiment was designed in which two groups of larval density(0.5 , 1 indmL-1) were treated with different concentration of probiotic bacteria without water exchange, and control group with and without water exchange. The best growth rate was found in group treated with 40 LL-1 photosynthetic bacteria and 2 gL-1 Bacillus in this experiment. For the groups reared at 0.5 indmL-1, survival was not significantly different. For the groups reared at 1 indmL-1, only when treated with 40 LL-1 photosynthetic bacteria and 2 gL-1 Bacillus,was larvae survival not significanty different from the control group with water exchange.