Age determination and growth of Cyclina sinensis (Bivalvia, Veneridae) by external rings in Busan, Korea

Abstract

Age and growth of Cyclina sinensis were investigated during the period from August 2019 to September 2020 in Busan, Korea. The shell length range is 14.78 ~ 50.49 mm, shell height is 14.09 ~ 51.76 mm and shell width is 8.25 ~ 34.37 mm. The relationship between shell length (SL; mm) and shell height (SH; mm) was expressed by the equation SH=1.0407SL-1.7958 (r2=0.97, n=625, P<0.01) and between SL and shell width (SW; mm) by the equation SW=0.6884SL-2.3306 (r2=0.92, n=625, P<0.01). The relationship between SL and total weight (TW; g) was expressed by the following equation: TW=0.00006SL3.4559 (r2=0.95, n=389, P<0.01). We estimated the age of C. sinensis by reading the external rings on the shell. The age of this species ranged from 0 to 7 years. Based on external rings, the von Bertalanffy growth functions were expressed by the equation : SLt =79.94(1-e-0.114(t+0.947)) TWt=188.28(1-e-0.114(t+0.947))3.4559