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Cadmium accumulation in coastal demersal fish

机译：沿海沉鱼中的镉积累

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摘要

The hepatic Cd burden, measured on 291 individuals of 4 species of demersal fish (Gadus morhua, Reinhardtius hippoglossoides, Hippoglossoides platessoides, and Raja radiata), is 2 to 5 times higher in fish from the open Gulf of St. Lawrence than in fish from the St. Lawrence Estuary, 600 km landward. The higher Cd burden in the open Gulf is not related to the input of anthropogenic Cd, nor can it be attributed to differences in size, sex, sampling season, or state of health. Rather, the Cd burden in demersal fish may be related to sediment diagenesis, since the concentration of authigenic Cd (i.e. Cd minerals formed in the sediments) is higher in the Gulf than in the Estuary, which may lead in turn to Cd-enrichment in sediment-dwelling organisms. Measured Cd burdens in the liver agree with predictions made with a simple biokinetic model that uses realistic estimates of the Cd content of benthic invertebrates in combination with kinetic parameters determined in H. platessoides with in vivo gamma counting. These results strongly suggest that the Cd content of the diet, rather than of the water phase, determines the hepatic Cd burden in these demersal fish species.
机译：在4种深海鱼类（Gadus morhua，Reinhardtius hippoglossoides，Hippoglossoides platesoides和Raja radiata）的291个人身上测得的肝Cd含量比在圣劳伦斯湾裸露的鱼中高2至5倍距地面600公里的圣劳伦斯河口。在开阔的海湾中，较高的镉负担与人为的镉输入无关，也不能归因于大小，性别，采样季节或健康状况的差异。相反，深海鱼类中的Cd负担可能与沉积物成岩作用有关，因为海湾中自生Cd​​（即沉积物中形成的Cd矿物）的浓度高于河口，这可能导致Cd富集。沉积物生物。肝脏中Cd负荷的测量结果与简单的生物动力学模型所得出的预测相符，该模型使用底栖无脊椎动物Cd含量的实际估计值与在H. Platesides中测定的动力学参数结合体内γ计数。这些结果有力地表明，饮食中的镉含量而非水相决定了这些鱼类的肝脏中镉的负担。

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