title: Histopathological effects of hexavalent chromium in the ovary of a fresh water fish, Channa punctatus (Bloch).
abstract: The histopathological effects of hexavalent chromium (Cr VI) in the ovary of a fresh water teleost, Channa punctatus were investigated. An exposure-dependent alteration in ovarian histology is reported. For both acute and chronic exposures to Cr (VI), the percentages of atretic oocytes were increased; this increase was more pronounced in the acute exposure group. A decrease in percentage of vitellogenic oocytes was observed in the chronic exposure group indicating impairment of vitellogenesis. The hepatocellular vacuolization and atrophy along with pyknotic nuclei in both acute and chronic chromium exposed fish liver supports the vitellogenic impairment. The observed alterations may be due to both direct cytotoxic effect of Cr (VI) on the ovary as well as mediation by overall systemic toxicity affecting other vital organs.
authors.affiliation: Department of Zoology, University of Allahabad, Allahabad 211002, India.
authors.forename: Ashish Kumar
authors.initials: AK
authors.lastname: Mishra
authors.forename: Banalata
authors.initials: B
authors.lastname: Mohanty
mesh_terms: D000818:Animals; D002274:Carcinogens, Environmental / Q000633:toxicity*; D002467:Cell Nucleus / Q000187:drug effects / Q000473:pathology; D002857:Chromium / Q000633:toxicity*; D005260:Female; D005399:Fishes; D005496:Follicular Atresia / Q000187:drug effects; D022781:Hepatocytes / Q000187:drug effects / Q000473:pathology; D009865:Oocytes / Q000187:drug effects / Q000473:pathology; D010053:Ovary / Q000187:drug effects* / Q000473:pathology; D011192:Potassium Dichromate / Q000633:toxicity*; D018675:Toxicity Tests; D014617:Vacuoles / Q000187:drug effects / Q000473:pathology; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D002274:Carcinogens, Environmental; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D011192:Potassium Dichromate