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Pathological assessment of fishes and water quality of Billings Dam

Santos, Sandy Lorena Pulecio

Biblioteca Digital de Teses e Dissertações da USP; Universidade de São Paulo; Faculdade de Medicina Veterinária e Zootecnia 2018-02-01

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  • Título:
    Pathological assessment of fishes and water quality of Billings Dam
  • Autor: Santos, Sandy Lorena Pulecio
  • Orientador: Sá, Lilian Rose Marques de
  • Assuntos: Abastecimento Hídrico; Biomonitoramento Ambiental; Toxicologia Ambiental; Peixes Brasileiros; Patologia De Peixes; Fish Pathology; Environmental Toxicology; Environmental Biomonitoring; Brazilian Fish; Water Supply
  • Notas: Dissertação (Mestrado)
  • Descrição: The environmental agencies has been monitoring water reservoirs such as the Billings dam with the purpose of protection and conservation of water resources based on periodical water and sediment analyses, but it does not use fish as bioindicators routinely. The study aimed to characterize water quality of the Billings dam based on integrated analyses of water and sediment parameters in addition to pathological assessment of tilapias (n=103), acaras (Geophagus brasiliensis, n=246), and trairas (Hoplias malabaricus, n=78). Samplings of water, sediment and fish were executed in six sites of the dam in summer and spring of 2014 and 2015. Analytical methods for water and sediment parameters were carried out according to standard methods, while the pathological evaluation of fish involved the Fulton index, gross lesions evaluations, the macroscopic index and histopathological diagnosis of gills, liver, kidney, and spleen lesions, and their histopathological indices. Water and sediment analyses characterized the water as a eutrophic environment and polluted by metals. Water parameters showed improvement in 2015, but physicochemical, biological, chronic toxicity results, and metals criteria were in part above historic average and legal limits required. The pathological evaluation revealed that the three fish species responded to environmental conditions in different ways and presented worse indices in 2015. Gills were the main organ affected in all species studied and the principal tissue response was regressive and reversible pattern. The indices of trairas were the highest and this species was considered the best for biomonitoring the Billings dam. Comprehensive approach of water, sediment and fishes parameters allowed the evaluation of water quality of the Billings dam and it may represent one of the ways to evaluate its environmental conditions as well as the quality of the fish consumed in the region.
  • DOI: 10.11606/D.10.2018.tde-12072018-143446
  • Editor: Biblioteca Digital de Teses e Dissertações da USP; Universidade de São Paulo; Faculdade de Medicina Veterinária e Zootecnia
  • Data de publicação: 2018-02-01
  • Formato: Adobe PDF
  • Idioma: Inglês

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