Effects of storage on the microbial quality of slipper oysters, Crassostrea iredalei
The effects of storage on the microbial quality of slipper oysters, Crassostrea iredalei, were examined. Oysters were stored at room temperature (24°C), under a blanket of ice (3-4 C), chilled (4-C) and frozen (-25°C) until they spoiled. The shelf life of oysters stored at room temperature was only two days. Oysters held under a blanket of ice had a shelf life of 14 days and chilled oysters, 22 days. Frozen oysters remained in good condition over the 64 day storage period. The initial total aerobic bacterial count of oysters was 105cfu/g. Counts for frozen oysters decreased by 1 log (104) while counts for oysters stored at other temperatures increased by 2-4 log (107-109). Bacterial typing of 50 randomly-picked colonies made every four days showed Pseudomonas to be the predominant spoilage organism. Total and fecal coliform counts did not increase even for oysters held at room temperature. Typical Staphylococcus aureaus colonies were isolated but were shown to be non-pathogenic by the coagulase test. Analyses for the presence of other organisms of public health concern revealed that Salmonella, Shigella, Vibrio cholerae, V. parahaemolyticus, Lactose + Vibrios (V. vulnificus) and fecal streptococci were present in very low or undetectable levels. Thus, hazards or risks associated with these organisms may be considered minimal.
Wise use of important mollusc species in mangrove areas: Malaysia Nair, Devakie (Aquaculture Department, Southeast Asian Fisheries Development Center, 2000)For centuries, several edible mollusc species are being collected for food by coastal communities from these mangrove ecosystems. The most common molluscs collected are cockles, various species of oysters, clams and ...
Mangrove-associated mollusc research at SEAFDEC/AQD De Castro-Mallare, Teresa R. (Aquaculture Department, Southeast Asian Fisheries Development Center, 2000)Mollusc research at the Aquaculture Department of the Southeast Asian Fisheries Development Center started in 1975 and focused on two commercially important mangrove-associated bivalves, the slipper-shaped oyster (Crassostrea ...
Growth and survival of oyster Crassostrea iredalei (Faustino, 1932): A comparison of wild and hatchery-bred spat in grow-out culture Lebata-Ramos, Ma. Junemie Hazel; Dionela, Cleresa S.; Novilla, Schedar Rose M.; Sibonga, Rema; Solis, Ellen Flor D.; Mediavilla, Jonas P. (Elsevier, 2020-12-25)Oyster farming is an important industry both in developed and developing countries. The high demand for oysters has caused overexploitation of natural stocks. This led to dwindling spat fall and unstable production. This ...