title: Acute exposure of a glyphosate-based herbicide affects the gills and liver of the Neotropical fish, Piaractus mesopotamicus.
abstract: The aim of this study was to determine the acute toxicity of Roundup(®) Ready (RR) in Piaractus mesopotamicus, and evaluate the effects on the morphology of the gills and liver of exposed surviving fish. Fish were exposed to 3.0, 3.5, 4.0 and 4.5mgL(-1) of glyphosate, and the LC(50);48h was estimated at 3.74±0.2mgL(-1). Gill histopathology was rare, and the activity of Na(+)/K(+)-ATPase enzyme did not change, suggesting normal function. However, the damage to the liver was classified as moderate to severe. Cytoplasmic vacuolization, lipid accumulation, nuclear and cellular membrane alterations and glycogen depletion were found in the liver, suggesting a reduction in the liver function. The glyphosate in the RR formulation was classified as moderately toxic for P. mesopotamicus, and the severe damage in the liver may affect the detoxification and/or tissue repair process and contribute to fish death.
authors: Programa de Pós-graduação em Ecologia e Recursos Naturais, Universidade Federal de São Carlos, São Carlos, São Paulo, Brazil.
authors: Natália S
authors: NS
authors: Shiogiri
authors: Departamento de Ciências Fisiológicas, Universidade Federal de São Carlos, São Carlos, São Paulo, Brazil.
authors: Marcelo G
authors: MG
authors: Paulino
authors: Departamento de Fitosanindade, Universidade Estadual Paulista, Jaboticabal, São Paulo, Brazil.
authors: Silvia P
authors: SP
authors: Carraschi
authors: Departamento de Ciências Fisiológicas, Universidade Federal de São Carlos, São Carlos, São Paulo, Brazil.
authors: Flávia G
authors: FG
authors: Baraldi
authors: Departamento de Fitosanindade, Universidade Estadual Paulista, Jaboticabal, São Paulo, Brazil.
authors: Claudinei
authors: C
authors: da Cruz
authors: Departamento de Ciências Fisiológicas, Universidade Federal de São Carlos, São Carlos, São Paulo, Brazil. Electronic address: dmnf@ufscar.br.
authors: Marisa Narciso
authors: MN
authors: Fernandes
mesh_terms: D000818:Animals; D060125:Characiformes; D005880:Gills / Q000187:drug effects* / Q000201:enzymology / Q000473:pathology; D005998:Glycine / Q000031:analogs & derivatives* / Q000633:toxicity; D006003:Glycogen / Q000378:metabolism; D006540:Herbicides / Q000633:toxicity*; D008099:Liver / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism; D023382:Toxicity Tests, Acute; D000097797:Glyphosate
chemical_list: D005998:Glycine; D006003:Glycogen; D006540:Herbicides; D000254:Sodium-Potassium-Exchanging ATPase; D000097797:Glyphosate