Thus, decreasing pH of oyster meats has been used in several studies as an indicator of decomposition since it was first suggested byHunter and Linden (1923). They suggested that oysters with shell liquor with a pH below 5 were usually spoiled, whereas a pH of 6.1–5.6 represented a zone where oysters were changing from good to sour. The microbial profile of fresh oysters likely changes in line with microbial communities present in harvest waters and often includes Vibrio spp. ( Cook, 1991 and ICMSF, 2005). However, as spoilage proceeds,Pseudomonas and Vibrio spp. have been reported to become more abundant in the profile, with enterococci, lactobacilli, and yeasts dominating the later stages