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Alterations on growth and gill morphology of Danio rerio (Pisces, Ciprinidae) exposed to the toxic sediments BABT
Fracácio,Renata; Verani,Nelsy Fenerich; Espíndola,Evaldo Luiz Gaeta; Rocha,Odete; Rigolin-Sá,Odila; Andrade,Cássio Arilson.
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...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gill morphology; Sediment toxicity; Danio rerio; Tietê reservoirs; Pollution.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400023
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Growing, losing or introducing? Cage aquaculture as a vector for the introduction of non-native fish in Furnas Reservoir, Minas Gerais, Brazil Neotropical Ichthyology
Azevedo-Santos,Valter Monteiro de; Rigolin-Sá,Odila; Pelicice,Fernando Mayer.
Cage aquaculture has been developed in many countries, including Brazil. This form of production, although economically productive, may cause several impacts to the environment. Considering the historical relationship between aquaculture and species introduction, our study investigated the potential of cage aquaculture in spreading non-native species into hydroelectric reservoirs. We interviewed 19 fish farmers in Furnas Reservoir, Grande River basin. All producers have grown exclusively Nile tilapia (Oreochromis niloticus), an African fish, and all producers reported the occurrence of fish escapes. Releases were mainly accidental, but highly frequent during some management procedures, such as length classification, fish capture and juvenile stocking....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Escapes; Introduced fish; Management; Neotropic; Oreochromis niloticus; Tilapia.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400024
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