For the purpose of the rational management and stock propagation, this paper deals with a detailed investigation on the population dynamics of clam (Ruditapes philippinarum) at Huangden area in Xiangshan harbour during the period of July 1984 to October' 1985. The stock composition is mainly made up of two years old clams, being up to 87.5% of the total. According to the variation in the increment rate of shell fringe new rings largely appear in December. The shell length and shell height as function of the...