Show simple item record Martinez, Cláudia Bueno dos Reis Souza, Marta Marques de 2011-06-30T02:20:12Z 2011-06-30T02:20:12Z 2002
dc.identifier.citation MARTINEZ. Cláudia Bueno dos Reis ; SOUZA, Marta Marques de. Acute effects of nitrite on ion regulation in two neotropical fish species. Comparative Biochemistry and Physiology. A, Molecular & Integrative Physiology, Reino Unido, v. 133, n. 1, p. 151-160, 2002. Disponível em: <>. Acesso em: 17 jun. 2011. pt_BR
dc.identifier.issn 1095-6433
dc.description.abstract To broaden the understanding of physiological responses of tropical fish to environmental stressors, the effects of nitrite on haematological parameters and plasma and red blood cell ion regulation were studied in two neotropical fish species, Astyanax altiparanae and Prochilodus lineatus. Both fish species were exposed to NaNO (30 mg ly1) over a 2 96-h period and blood samples were taken for ion and haematological analyses. The results revealed that nitrite leads to a decrease in P. lineatus blood haematocrit and haemoglobin content and an increase in blood methaemoglobin. A. altiparanae did not exhibit any significant difference in these haematological parameters. During the exposure to NOy2 both fish species had significantly reduced plasma Naq concentration and red blood cell (RBC) Kq concentration, but only P. lineatus showed an increase in extracellular Kq concentration. When RBC volume was analyzed in vitro, after 2 min of exposure to NaNO2, a 36% shrinkage was observed in P. lineatus cells, while only a 10% shrinkage was observed in A. altiparanae cells. These results suggest that for P. lineatus, nitrite entrance into the cell leads to methaemoglobin formation and Kq efflux, causing red cell shrinkage and increased plasma Kq. However, A. altiparanae proved to be a species more resistant to nitrite, exhibiting fewer responses to this compound. pt_BR
dc.language.iso eng pt_BR
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dc.subject Methaemoglobin pt_BR
dc.subject Potassium regulation pt_BR
dc.subject Red blood cell volume pt_BR
dc.subject Haematocrit pt_BR
dc.subject Nitrite pt_BR
dc.subject Neotropical fish pt_BR
dc.subject Astyanax altiparanae pt_BR
dc.subject Prochilodus lineatus pt_BR
dc.title Acute effects of nitrite on ion regulation in two neotropical fish species pt_BR
dc.type article pt_BR

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