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Ionic regulation and Na + –K + ‐ATPase activity in gills and kidney of the freshwater stingray Paratrygon aiereba living in white and blackwaters in the Amazon Basin
Author(s) -
Duncan W. P.,
Costa O. T. F.,
Araújo M. L. G.,
Fernandes M. N.
Publication year - 2009
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2008.02156.x
Subject(s) - gill , biology , stingray , kidney , zoology , urea , freshwater fish , environmental chemistry , ecology , fish <actinopterygii> , fishery , biochemistry , endocrinology , chemistry
During low‐water period, freshwater stingray Paratrygon aiereba collected in the whitewater (WW) of the River Amazon showed higher urea content, osmolality, Na + and Cl − concentrations in plasma and perivisceral fluid than those caught in blackwater (BW) of the River Negro. Gills and kidney Na + –K + ‐ATPase activities were significantly lower in WW than in BW fish. The high level of kidney Na + –K + ‐ATPase activity in P. aiereba may minimize ion loss and generate diluted solute‐free urine in ion‐poor BW environment.