An investigation on one of the dominant species of gastropods, Bellamya aeruginosa in Houhu Lake, Wuhan was carried out from April, 1996 to March, 1997.The results showed that the population was composed of three year classes, among which the 96 year class grew most quickly, with instantaneous growth rate of dry weight (unshelled) 2.80.The annual production of the animal calculated by instantaneous growth rate method was: wet weight, 33.13 g m^-2a^-1;dry weight (unshelled), 1.932 g m^-2a^-1.The corresponding annual P/B ratios was 0.85.