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Fish antioxidant defenses--a comparative approach

D Wilhelm Filho1

  • 1Departamento de Biologia, Universidade Federal de Santa Catarina, Florianópolis, Brasil. dawifi@mbox1.ufsc.br

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|December 1, 1996
PubMed
Summary

Fish antioxidant defenses (AD) vary by species activity and environment. Marine fish activity correlates with higher SOD and CAT levels, while freshwater fish AD relates to environmental factors, offering protection against temperature changes.

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Area of Science:

  • Comparative physiology
  • Biochemistry
  • Aquatic toxicology

Background:

  • Limited comparative research exists on vertebrate antioxidant defenses (AD).
  • Fish possess enzymatic (superoxide dismutase [SOD], catalase [CAT]) and non-enzymatic antioxidant systems.
  • Aquatic organisms face environmental challenges like temperature fluctuations impacting metabolic rates.

Purpose of the Study:

  • To compare enzymatic and non-enzymatic antioxidant defenses in diverse fish species.
  • To investigate the relationship between fish activity levels and antioxidant status.
  • To explore the influence of environmental factors on fish antioxidant defenses.

Main Methods:

  • Analysis of liver and blood samples from 37 fish species (15 marine, 22 freshwater).

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  • Quantification of SOD, CAT, alpha-tocopherol, beta-carotene, ubiquinol 10, and blood glutathione.
  • Correlation of antioxidant levels with species activity and environmental parameters.

    • Main Results:

    • More active marine fish exhibited higher liver and blood SOD and CAT concentrations than sedentary species.
    • Freshwater fish antioxidant status appeared linked to environmental characteristics rather than activity.
    • Fish generally display high antioxidant defense levels, potentially protecting against temperature-induced metabolic stress.

    Conclusions:

    • Fish antioxidant defenses are influenced by a combination of activity level and environmental conditions.
    • Higher antioxidant capacity in fish may be an adaptation to fluctuating temperatures and metabolic demands.
    • This study provides insights into the adaptive strategies of fish antioxidant systems in different aquatic environments.