Age Composition and Growth of Cerithidea Cingulatus in Ningbo Coast

The age composition and growth of Cerithidea cingulatus in Ningbo Coast are reported. The majority of the natural population consists of by 1 + and 2 + ages. Shell height and shell width, aperture height are linearly correleted the correlation between shell height and weight of body is the exponential. The regression equation of shell height(H,mm) and shell width(B,mm) is B=0.332 5 H+0.483 1(r=0.919 5), the regression equation of shell height(H,mm) and aperture height(L,mm) is L=0.245 9 H+1.373 8(r=0.922 4), the regression equation of shell height(H,mm) and the weight of body(W,g) is W=0.000 2 H 2.687 6 (r=0.978 1). The growth of Cerithidea cingulatus is indicated by the height.