| Popis: |
This study investigated the influence of age and tissue weight on cadmium (Cd) levels in Pacific oysters (Crassostrea gigas). Oysters from 4 different age groups (1, 2, 3, and 4 y) were collected at an oyster farm in Willapa Bay, Washington. To examine the effects of age, 60 oysters from each group were sorted into 3 composites of 20, and Cd analysis was carried out on all composite samples. To study the effects of tissue weights, 25 oysters from each of the 4 age groups were collected and analyzed individually for Cd. All oyster Cd concentrations were below the 3.7 ppm (μg/g) wet wt Food and Drug Administration (FDA) level of concern and the 2 ppm wet wt Hong Kong limit. There was a moderate correlation between Cd concentration and age (R2 = 0.60). The 1-y-old oysters had significantly lower Cd concentrations than the 2–4-y-old oysters. Tissue weight also influenced Cd concentration (R2 = 0.31). The effect of tissue weight was found to vary with age, with a stronger correlation to Cd levels in t... |
