Contaminant concentrations in filter-feeding shellfish may indicate the health of coastal waters and consumption risks. Widespread expansion of the Pacific oyster (Crassostrea gigas) and its popularity as food make it a useful sentinel. We surveyed intertidal Pacific oysters in San Diego Bay, California for contaminants during summer 2018 and winter 2019. We compared contaminants in Pacific oyster to California mussel from California's State Mussel Watch Program (1993–2003) and human consumption thresholds. Contaminants such as neonicotinoid and chlorinated pesticides, selenium, and several metals were higher in Pacific oysters in summer, while PBDEs, benzylbutyl phthalate, and plastics were higher in winter. Contaminant levels were generally lower in Pacific oyster than mussel except for copper and zinc. Bay-wide PCB concentrations in oysters exceeded thresholds but individual samples (locations) also met or surpassed chlordane, PCB and PAH thresholds. Monitoring and risk assessments that consider species' biology, season, location, effects of multiple contaminants, and human consumption patterns will contribute to more effective consumption guidelines.

滤食性贝类中的污染物浓度可能表明沿海水域的健康状况和消费风险。太平洋牡蛎 ( Crassostrea gigas ) 的广泛扩张) 及其作为食物的受欢迎程度使其成为有用的哨兵。我们在 2018 年夏季和 2019 年冬季调查了加利福尼亚州圣地亚哥湾潮间带太平洋牡蛎的污染物。我们比较了加利福尼亚州贻贝观察计划（1993-2003 年）和人类消费阈值中太平洋牡蛎和加利福尼亚贻贝中的污染物。夏季太平洋牡蛎中的新烟碱类和氯化农药、硒和几种金属等污染物含量较高，而冬季多溴二苯醚、邻苯二甲酸苄基丁酯和塑料含量较高。除铜和锌外，太平洋牡蛎的污染物水平普遍低于贻贝。牡蛎中的全湾多氯联苯浓度超过阈值，但个别样本（地点）也达到或超过氯丹、多氯联苯和多环芳烃的阈值。考虑物种生物学的监测和风险评估，