Data/hora: 13/06/2024 05:50:15

Provedor de dados: | 52
País: | Brazil
Título: | Alterations on growth and gill morphology of Danio rerio (Pisces, Ciprinidae) exposed to the toxic sediments
Autores: | Fracácio,Renata; Verani,Nelsy Fenerich; Espíndola,Evaldo Luiz Gaeta; Rocha,Odete; Rigolin-Sá,Odila; Andrade,Cássio Arilson.
Data: | 2003-12-01
Ano: | 2003
Palavras-chave: | Gill morphology; Sediment toxicity; Danio rerio; Tietê reservoirs; Pollution.
Resumo: | The objective of this work was to assess the toxicity of sediment samples from six cascade reservoirs in Tietê river system, in São Paulo State, Brazil, through chronic-partial toxicity bioassays with Danio rerio larvae as test-organisms. Histology of gills and biometric measurements were used to determine the existence of toxicity problems. The alterations on gill morphology here detected were considered of first stage (hyperplasia, lamellar junction and excess of mucous cells) in the first reservoirs and very slight in the last ones. The biometric analysis pointed to inadequate conditions for the growth of the test-organisms when exposed to the sediment of the rivers and upstream reservoirs and also indicated an improvement of environmental conditions along the system.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400023
Editor: | Instituto de Tecnologia do Paraná - Tecpar
Relação: | 10.1590/S1516-89132003000400023
Formato: | text/html
Fonte: | Brazilian Archives of Biology and Technology  v.46 n.4 2003
Fonte: | info:eu-repo/semantics/openAccess