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Nuclear abnormalities in erythrocytes and morphometric indexes in the catfish Cathorops spixii (Ariidae) from different sites on the southeastern Brazilian coast

Abstracts

Nuclear abnormalities in erythrocytes (NAE) were taken as biomarkers in the catfish Cathorops spixii (Ariidae) sampled in an estuary little affected by human activity (Cananéia) and in three regions (Santos Channel: SC, Santos Bay: SB and São Vicente Channel: SVC) of the Santos-São Vicente estuary impacted by various anthropogenic activities. Increases in NAE were observed in fish from SC and SVC sampled in the summer period as compared with specimens from the Cananéia estuary. These results suggest the presence of genotoxic compounds in these regions. However, the absence of significant differences in micronuclei frequency reflects slight mutagenic effects in these individuals. It is possible that the lower NAE frequency in specimens from SB might be associated with the greater remobilization and dilution of chemicals in this region. The low frequency of NAE in C. spixii from the Cananéia estuary is in accordance with the slight anthropogenic influence in this system, and may be suggestive of the absence of genotoxic and mutagenic effects in these organisms.

nuclear abnormalities; genotoxicy; biomonitoring; estuaries; catfish; Cathorops spixii


Alterações nucleares eritrocitárias (ANE) foram consideradas como biomarcadores nos bagres Cathorops spixii (Ariidae) amostrados em um estuário com baixa influência humana (Cananéia) e em três regiões (Canal de Santos: CS, Baía de Santos: BS e Canal de São Vicente: CSV) no estuário de Santos-São Vicente, impactado por diversas atividades antropogênicas. Aumentos nas ANE foram observados nos peixes amostrados no CS e CSV durante o período de verão, quando comparados com os espécimes do estuário de Cananéia. Estes resultados sugerem a presença de compostos genotóxicos nessas regiões. Entretanto, ausência de diferenças significativas na freqüência de micronúcleos refletem baixos efeitos mutagênicos nesses indivíduos. As menores freqüências de ANE nos espécimes amostrados na BS podem estar associado à maior remobilização e diluição dos compostos químicos na região. A baixa freqüência de ANE em C. spixii do estuário de Cananéia corrobora a menor influência antropogênica nesse sistema, e pode estar sugerindo ausência de efeitos genotóxicos e mutagênicos nos organismos.

alterações nucleares; genotoxicidade; biomonitoramento; estuários; bagres; Cathorops spixii


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Publication Dates

  • Publication in this collection
    30 Oct 2012
  • Date of issue
    Sept 2012

History

  • Received
    13 July 2011
  • Accepted
    20 July 2012
  • Reviewed
    19 May 2012
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