Ke Yizhou, Ou Changchun, Guo Xiaoyu, Liu Shuyi, Yao Chenlu, Shi Bo, Que Huayong
Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture and Rural Affairs, Jimei University, Xiamen 361021, China.
State Key Laboratory of Mariculture Breeding, Fisheries College of Jimei University, Xiamen 361021, China.
Toxics. 2024 Aug 31;12(9):645. doi: 10.3390/toxics12090645.
Oysters are a group of economically important bivalves in China, with estuaries serving as one of their primary cultivation areas. However, heavy metal pollution in these estuarine environments poses a potential threat to aquaculture by leading to the accumulation of heavy metals in farmed oysters, which could impact their safety and marketability. This study was conducted in the aquaculture area of the Luoyangjiang River estuary, where eight sampling sites were selected. Water, sediment, and oysters categorized by shell length were collected from each site. The concentrations of heavy metals (Ag, As, Cd, Cr, Cu, Ni, Pb, and Zn) were determined in both the environmental samples and oyster tissues. Additionally, multiplex species-specific PCR was used to identify oyster species. The results showed significant variations in dissolved-phase and suspended particulate matter (SPM) metal concentrations across different sampling sites, while sediment metal concentrations were more consistent but similar to those in SPM. The large oysters were comprised of 50% and 50% , while small oysters were identified as . The Cd, Cu, Pb, and Zn levels in both size groups of oysters exceeded data from previous studies, indicating contamination in the estuary. The observed differences in heavy metal concentrations between large and small oysters primarily reflect species-specific variability in metal accumulation, which may also be influenced by factors such as growth and exposure duration. Furthermore, the lack of significant correlation between metal concentrations in environmental media and oysters suggests that oysters may be exposed to multiple sources of metal contamination.
牡蛎是中国一类具有重要经济价值的双壳贝类，河口是其主要养殖区域之一。然而，这些河口环境中的重金属污染对水产养殖构成了潜在威胁，因为这会导致养殖牡蛎体内重金属积累，进而影响其安全性和市场价值。本研究在洛阳江河口养殖区开展，在该区域选取了8个采样点。从每个采样点采集了水、沉积物以及按壳长分类的牡蛎。测定了环境样品和牡蛎组织中重金属（银、砷、镉、铬、铜、镍、铅和锌）的浓度。此外，采用多重物种特异性PCR鉴定牡蛎种类。结果表明，不同采样点的溶解相和悬浮颗粒物（SPM）金属浓度存在显著差异，而沉积物金属浓度较为一致，但与SPM中的浓度相似。大牡蛎由50%的[此处原文缺失具体种类信息]和50%的[此处原文缺失具体种类信息]组成，而小牡蛎被鉴定为[此处原文缺失具体种类信息]。两个大小组牡蛎中的镉、铜、铅和锌含量均超过了以往研究数据，表明河口受到了污染。观察到的大小牡蛎之间重金属浓度差异主要反映了金属积累的物种特异性差异，这也可能受到生长和暴露时间等因素的影响。此外，环境介质和牡蛎中金属浓度之间缺乏显著相关性，这表明牡蛎可能受到多种金属污染源的影响。
