We studied the population dynamics and annual production of Rivularia auriculata in the Junshan Lake from April 2005 to March 2006.The results showed that the population was composed of three years classes,with the annual average density being 8.12 ind·m-2,and the annual average biomass being 13.37 g·m-2.The peaks of density and biomass were observed in August(24 ind·m-2) and in September(30.32 g·m-2),respectively.The lowest values of density(3.2 ind·m-2) and biomass(3.872 g·m-2) were found in March.The annual production of R.auriculata calculated by instantaneous growth rate method was 3.5592(g·m-2·a-1),and the corresponding annual P/B ratio was 0.27.Compared with other research,the result was reasonable.The P/B ratio was low,showing this resource became rarer. So this resource should be protected and used reasonably.
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