SOME MORPHOLOGICAL CHARATERISTICS OF JINJIANG OYSTERS Crassostrea rivularis (Gould, 1861)IN CENTRAL VIETNAM

Abstract

Jinjiang oysters Crassostrea rivularis (Gould, 1861) belong to the phylum Mollusca, the class Bivalvia. C. rivulariswas first described by Gould (1861) based on a specimen collected from Southern China and subsequently used to describe oysters in Japan and China. Specimens C. rivularis used in this study were collected from some localities in Central Vietnam (viz. Quang Ninh, Quang Binh; Gio Linh, Quang Tri; Phu Loc, Thua Thien Hue; Da Nang; Duy Xuyen, Quang Nam and Nui Thanh, Quang Nam). The mean shell height (SH), shell length (SL), shell width (SW) and umbo cavity depth (UCD) are 70.95, 43.20, 29.39 and 10.93 mm respectively. The mean shell volume (SV) and shell cavity volume (SCV) are 18.67 and 16.71 ml respectively. The mean dry shell weight (DSWT) is 33.45 g. The mean ligamental channel height (LCH) and ligamental channel length (LCL) are 6.86 and 5.82 mm respectively. The mean SH/SL, LCH/LCL and DSWT/SV ratio are 1.68, 1.21 and 1.71 respectively.