RESUMO
Total mercury concentrations were determined in the gonadal tissues of 15 female and 10 male European perch (Perca fluviatilis) from one location of the stream "Jevanský potok" located about 30 km from Prague (Czech Republic). Tissue samples were frozen at -26 °C in polypropylene containers until further processing, which was carried out using an Advance Mercury Analyser (single purpose atomic absorption spectrometer). Mercury concentrations were present in all analysed gonad samples, and ranged from 2.3 to 12.7 µg/kg wet weight. However, we determined a mean Hg concentration (9.45 µg/kg) in male gonads that was 2.4 times greater than that of female gonads (3.9 µg/kg). This is an important finding when taking into account fish sex in environmental pollution monitoring (especially for mercury contamination).
Assuntos
Monitoramento Ambiental/métodos , Peixes/fisiologia , Gônadas/metabolismo , Mercúrio/metabolismo , Poluentes Químicos da Água/metabolismo , Animais , República Tcheca , Feminino , Masculino , Mercúrio/toxicidade , Rios/química , Fatores Sexuais , Poluentes Químicos da Água/toxicidadeRESUMO
The samples from 13 perches (Perca fluviatilis) - muscle with skin and bones; fish gonads; and acanthocephalan parasites were analysed for mercury (Hg). Hg concentrations were present in all analysed samples. There were found no statistically significant difference in Hg concentration in fish tissues between perches either with or without infection by the acanthocephalan parasite, Acanthocephalus lucii). In this study there was no evidence that acanthocephalan worms accumulate mercury from hosts. For this reason, A. lucii is not a suitable bioindicator for mercury pollution.
Assuntos
Acantocéfalos/metabolismo , Doenças dos Peixes/parasitologia , Mercúrio/metabolismo , Percas/parasitologia , Poluentes Químicos da Água/metabolismo , Animais , Monitoramento Ambiental/métodos , Feminino , Doenças dos Peixes/metabolismo , Gônadas/efeitos dos fármacos , Gônadas/metabolismo , Masculino , Mercúrio/toxicidade , Músculos/efeitos dos fármacos , Músculos/metabolismo , Percas/fisiologia , Estresse Fisiológico , Poluentes Químicos da Água/toxicidadeRESUMO
We monitored concentrations of Cd, Cu, Mn and Zn in acantocephalan parasites (Acanthocephalus lucii) and its final host (Perca fluviatilis). The concentrations in parasites were found to be significantly higher than those found in the muscle, gonads and liver of fish host. The bioaccumulation factor values (BF=C(parasite)/C(host muscle)) were 194, 24.4, 2.2 and 4.7 for Cd, Cu, Mn and Zn, respectively. This suggests a benefit for the host due to the high accumulation of toxic cadmium.
Assuntos
Acantocéfalos/química , Intestinos/parasitologia , Metais Pesados/análise , Percas , Poluentes Químicos da Água/análise , Animais , Cádmio/análise , Cádmio/farmacocinética , Cidades , Cobre/análise , Cobre/farmacocinética , República Tcheca , Monitoramento Ambiental , Água Doce , Manganês/análise , Manganês/farmacocinética , Metais Pesados/farmacocinética , Percas/metabolismo , Percas/parasitologia , Distribuição Tecidual , Poluentes Químicos da Água/farmacocinética , Zinco/análise , Zinco/farmacocinéticaRESUMO
Lead concentrations in the tissues of perch and its parasites were determined as mg/kg dw. Lead was found at higher concentrations in the acanthocephalans (11.56) than in different tissues (liver, gonads and muscle with skin and bone) of perch. With respect to fish tissues, the highest concentrations of lead were present in the liver (1.24), followed by the gonads (0.57) whereas the lowest concentrations were in the muscle with skin and bone (0.21). The bioconcentration factors for lead indicated that parasites accumulate metals to a higher degree than fish tissues--lead concentrations in acanthocephalans were 9.32, 19.27 and 55.05 higher than in liver, gonads and muscles of host, respectively.