Fish Physiology and Biochemistry

, Volume 43, Issue 6, pp 1747–1759 | Cite as

Ammonia exposure and subsequent recovery trigger oxidative stress responses in juveniles of Brazilian flounder Paralichthys orbignyanus

  • Lucas Campos Maltez
  • Giovanna Rodrigues Stringhetta
  • Alain Danilo Enamorado
  • Marcelo Hideo Okamoto
  • Luis Alberto Romano
  • José María Monserrat
  • Luís André Sampaio
  • Luciano Garcia
Article

Abstract

The effects of ammonia exposure and recovery on oxidative stress parameters and histology of juvenile Brazilian flounder Paralichthys orbignyanus were evaluated. The fish were exposed to 0.12, 0.28 and 0.57 mg NH3-N L−1, plus a control, for 10 days followed by the same recovery time in ammonia-free water. Gill, liver and muscle samples (n = 9) were collected after 1, 5 and 10 days of exposure and after recovery for oxidative stress analysis (antioxidant capacity against peroxyl radicals (ACAP); glutathione S-transferase (GST) activity; lipoperoxidation levels measured through thiobarbituric acid reactive substances (TBARS) content). For histological assessment, gill, liver and brain samples were collected. Exposure to all NH3-N concentrations induced different time- and dose-dependent changes in oxidative stress parameters. Reduced antioxidant capacity of the liver and muscle and enhanced TBARS levels in the gills and liver were demonstrated. Differently, a high ammonia concentration elicited lower hepatic TBARS levels. Enhanced GST activity in all organs and increased antioxidant capacity of the gills were also observed. No ammonia-induced histopathological effects were demonstrated. After recovery, most parameters (liver ACAP, GST activity in the muscle and liver and TBARS in the gills) returned to baseline levels. However, liver TBARS and gill GST activity remained altered 0.57 mg NH3-N L−1 treatment. The recovery period also led to a decrease in gill antioxidant capacity and an increase in muscle antioxidant capacity. In conclusion, a concentration of 0.12 mg NH3-N L−1 induces oxidative stress and antioxidant responses in juvenile Brazilian flounder. Moreover, a 10-day recovery period is not sufficient to restore fish homeostasis.

Keywords

Nitrogen compound Lipid peroxidation Antioxidant system Glutathione S-transferase Histology 

Notes

Acknowledgements

This study was supported by research funds from the Conselho Nacional de Pesquisa e Desenvolvimento Científico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). The authors are grateful to CNPq for productivity research fellowships provided for L. Garcia, L. Sampaio, L. Romano and J. Monserrat, and to CAPES for a PhD scholarship provided for MSc. Lucas C. Maltez.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  • Lucas Campos Maltez
    • 1
  • Giovanna Rodrigues Stringhetta
    • 1
  • Alain Danilo Enamorado
    • 2
  • Marcelo Hideo Okamoto
    • 3
  • Luis Alberto Romano
    • 4
  • José María Monserrat
    • 2
  • Luís André Sampaio
    • 3
  • Luciano Garcia
    • 1
  1. 1.Laboratório de Aquacultura Continental, Instituto de OceanografiaUniversidade Federal do Rio Grande – FURGRio GrandeBrazil
  2. 2.Laboratório de Bioquímica Funcional de Organismos AquáticosUniversidade Federal do Rio Grande – FURGRio GrandeBrazil
  3. 3.Laboratório de Piscicultura Estuarina e Marinha, Instituto de OceanografiaUniversidade Federal do Rio Grande – FURGRio GrandeBrazil
  4. 4.Laboratório de Imunologia e Patologia de Organismos Aquáticos, Instituto de OceanografiaUniversidade Federal do Rio Grande – FURGRio GrandeBrazil

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