The omnivorous fish species, <i>C. nigrodigitatus</i> feeds mainly on benthic organisms and may therefore consume contaminated food throughout its food web. This can lead to the bioaccumulation of contamin...The omnivorous fish species, <i>C. nigrodigitatus</i> feeds mainly on benthic organisms and may therefore consume contaminated food throughout its food web. This can lead to the bioaccumulation of contaminants such as trace elements in their tissues. However, fish consumption is a major pathway of human exposure to contaminants which may cause public health problems. The aim of the present study is to assess trace elements contamination in some species from the food web of <i>C. nigrodigitatus</i>. For this, 10 main food items of the silver catfish were collected at two sites from February to July 2017 and analyzed using an Atomic Absorption Spectrometer coupled with a hydride and cold vapour generator. The concentrations of trace elements varied greatly from one species to another and within each species. These values ranged from 0.007 mg/kg for Hg in C hippos to 354.84 mg/kg for Mn in <i>P. fusca</i>. The most contaminated species by trace elements were benthic organisms: <i>M. perna</i> (Cd, Pb, Hg), <i>Pagurus</i> sp. (Cr, Ni, Cu, Zn), <i>G. paradoxa</i> (As) and <i>P. fusca</i> (Mn). The average concentrations of trace elements found in species were, for the most part, above WHO standards except Hg in <i>M. perna</i> and <i>G. paradoxa</i>. The water-based bioconcentration factors (BCFw) reach 92.58 for Cd, 44.72 for Pb, 382.49 for Hg and 1514.34 for As in <i>M. perna</i>. It is therefore necessary to pay particular attention to this ecosystem and to put in place a better management plan.展开更多
文摘The omnivorous fish species, <i>C. nigrodigitatus</i> feeds mainly on benthic organisms and may therefore consume contaminated food throughout its food web. This can lead to the bioaccumulation of contaminants such as trace elements in their tissues. However, fish consumption is a major pathway of human exposure to contaminants which may cause public health problems. The aim of the present study is to assess trace elements contamination in some species from the food web of <i>C. nigrodigitatus</i>. For this, 10 main food items of the silver catfish were collected at two sites from February to July 2017 and analyzed using an Atomic Absorption Spectrometer coupled with a hydride and cold vapour generator. The concentrations of trace elements varied greatly from one species to another and within each species. These values ranged from 0.007 mg/kg for Hg in C hippos to 354.84 mg/kg for Mn in <i>P. fusca</i>. The most contaminated species by trace elements were benthic organisms: <i>M. perna</i> (Cd, Pb, Hg), <i>Pagurus</i> sp. (Cr, Ni, Cu, Zn), <i>G. paradoxa</i> (As) and <i>P. fusca</i> (Mn). The average concentrations of trace elements found in species were, for the most part, above WHO standards except Hg in <i>M. perna</i> and <i>G. paradoxa</i>. The water-based bioconcentration factors (BCFw) reach 92.58 for Cd, 44.72 for Pb, 382.49 for Hg and 1514.34 for As in <i>M. perna</i>. It is therefore necessary to pay particular attention to this ecosystem and to put in place a better management plan.
