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首页> 外文期刊>Environmental toxicology and chemistry >ASSIMILATION AND BIOCONCENTRATION OF Ag AND Cd BY THE MARINE BLACK BREAM AFTER WATERBORNE AND DIETARY METAL EXPOSURE
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ASSIMILATION AND BIOCONCENTRATION OF Ag AND Cd BY THE MARINE BLACK BREAM AFTER WATERBORNE AND DIETARY METAL EXPOSURE

机译：水和饮食中金属暴露后海洋黑斑对银和镉的吸收和生物富集

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摘要

We determined the aqueous uptake and dietary assimilation of Cd and Ag by the marine black bream Acanthopagrus schlegeli following one to four weeks' exposure (or conditioning) to waterborne or dietary Cd or Ag at different concentrations. The concentrations of metals and metallothioneins (MT) in different tissues also were determined. The viscera contained the highest Ag, Cd, and MT concentrations after metal exposure. After exposure to waterborne metals, the metal and MT concentrations in the gills were higher than those in the remaining tissues (mainly muscles and bones), but this pattern was reversed following exposure to dietary metals. The assimilation efficiencies (AEs) of Cd and Ag ranged from 6 to 24% and 15 to 30%, respectively. The rate constant of uptake from the dissolved phase (k_u) of Cd and Ag ranged from 2.2 to 7.5 and 8.0 to 31.7 L kg~(-1) d~(-1), respectively. In all the exposure experiments, the k_u and AE increased with induced MT concentration and tissue metal concentration. Increasing metal accumulation may have been due to the increased available binding sites following the induction of MT in the fish. Furthermore, the MT induced by either Cd or Ag was not specific, but was able to bind with both metals and enhance bioaccumulation. Exposure to dissolved and dietary metals may increase metal accumulation, which potentially may lead to metal toxicity, although the fish may develop a tolerance to metals due to the apparent induction of MT.
机译：我们确定了海洋黑鲷Acanthopagrus schlegeli在不同浓度的水性或膳食Cd或Ag中暴露（或调节）一到四周后，其对Cd和Ag的水吸收和膳食同化。还测定了不同组织中金属和金属硫蛋白（MT）的浓度。暴露于金属后，内脏含有最高的Ag，Cd和MT浓度。暴露于水性金属后，the中的金属和MT浓度高于其余组织（主要是肌肉和骨骼）中的金属和MT浓度，但暴露于膳食金属后这种情况发生了逆转。 Cd和Ag的同化效率（AE）分别为6％至24％和15％至30％。 Cd和Ag溶解相的吸收速率常数（k_u）分别为2.2〜7.5和8.0〜31.7 L kg〜（-1）d〜（-1）。在所有暴露实验中，k_u和AE随着诱导MT浓度和组织金属浓度的增加而增加。金属积累的增加可能是由于鱼中MT诱导后可利用的结合位点增加所致。此外，由Cd或Ag诱导的MT不是特异性的，但能够与两种金属结合并增强生物积累。暴露于溶解的金属和饮食中的金属可能会增加金属的积累，这可能会导致金属毒性，尽管由于明显的MT诱导，鱼类可能对金属产生耐受性。

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