01919naa a2200241 a 450000100080000000500110000800800410001902400350006010000180009524501930011326000090030652010890031565000130140465000190141765000280143665000130146470000210147770000200149870000160151870000220153470000240155677300970158020021782014-12-10       2014    bl uuuu     u00u1 u    #d7 a10.1007/s00128-013-1174-52DOI1 aCASTRO, M. P.  aAcute Toxicity by Water Containing Hexavalent or Trivalent Chromium in Native Brazilian Fish, Piaractus mesopotamicusbAnatomopathological Alterations and Mortality.h[electronic resource]  c2014  aThis study evaluated the toxicity of hexavalent and trivalent compounds of chromium to the pacu, Piaractus mesopotamicus, in acute exposures of 96 h through mortality and histopathological responses. Hexavalent otassium dichromate was more toxic than trivalent compounds of chromium chloride, chromium oxide and chromium carbochelate. Sufficient mortalities occurred only with potassium dichromate to yield an LC50 value at 124.2 mg L-1. Hexavalent chromium caused reversible and irreversible lesions, which may affect organ functionality. Histopathological evaluation showed that trivalent chromium caused lesions of lower severity. Pacu subjected to different concentrations of chromium carbochelate showed no histopathological changes in the kidneys, liver, skin and gills, being similar to those of the control fish. Among the three sources of Cr3?, only chromium chloride at 200 mg L-1 resulted in mortality, which reached 100 % within the first 18 h. These findings confirm that trivalent chromium, when administered within recommended levels, may be used safely in aquaculture.  achromium  ahistopathology  aPiaractus mesopotamicus  atoxicity1 aMORAES, F. R. de1 aFUJIMOTO, R. Y.1 aCRUZ, C. da1 aBELO, M. A. de A.1 aMORAES, J. R. E. de  tBulletin of Environmental Contamination and Toxicology, Californiagv. 92, p. 213-219, 2014.