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  • Revisiting redox-active antioxidant defenses in response to hypoxic challenge in both hypoxia-tolerant and hypoxia-sensitive fish species

    Author(s)
    Leveelahti, L
    Rytkönen, KT
    Renshaw, GMC
    Nikinmaa, M
    Griffith University Author(s)
    Renshaw, Gillian M.
    Year published
    2014
    Metadata
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    Abstract
    It is not known whether changes in antioxidant levels always occur in fish in response to the oxidative stress that usually accompanies a hypoxic challenge. The studies of antioxidant responses to hypoxia in fish have mostly focused on very anoxia-tolerant species and indicate that there is an enhancement of antioxidant defenses. Here we present new data on redox-active antioxidants from three species, which range in their tolerance to hypoxia: the epaulette shark, threespine stickleback, and rainbow trout, together with a compilation of results from other studies that have measured oxidative stress parameters in hypoxia-exposed ...
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    It is not known whether changes in antioxidant levels always occur in fish in response to the oxidative stress that usually accompanies a hypoxic challenge. The studies of antioxidant responses to hypoxia in fish have mostly focused on very anoxia-tolerant species and indicate that there is an enhancement of antioxidant defenses. Here we present new data on redox-active antioxidants from three species, which range in their tolerance to hypoxia: the epaulette shark, threespine stickleback, and rainbow trout, together with a compilation of results from other studies that have measured oxidative stress parameters in hypoxia-exposed fish. The results suggest that in general, fish do not show an increase in redox-active antioxidant defense in response to oxidative stress associated with hypoxia. Rather, the changes in antioxidant defenses during hypoxia are very much species- and tissue-specific and are not linked to the level of hypoxia tolerance of the fish species.
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    Journal Title
    Fish Physiology and Biochemistry
    Volume
    40
    Issue
    1
    DOI
    https://doi.org/10.1007/s10695-013-9835-1
    Subject
    Cell metabolism
    Ecology
    Fisheries sciences
    Publication URI
    http://hdl.handle.net/10072/62486
    Collection
    • Journal articles

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