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Ageing in fishes

B K Patnaik1, N Mahapatro, B S Jena

  • 1Department of Zoology, Berhampur University, India.

Gerontology
|January 1, 1994
PubMed
Summary
This summary is machine-generated.

Fishes exhibit diverse aging patterns, from rapid senescence in species like salmon to gradual aging in most teleosts. Long-lived fish may have negligible senescence, but more research is needed to understand these varied aging mechanisms.

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Area of Science:

  • Gerontology
  • Ichthyology
  • Comparative Biology

Background:

  • Fishes display three distinct senescence patterns: rapid, gradual, and potentially negligible.
  • Gradual senescence, common in vertebrates, is well-documented in teleosts, while rapid senescence occurs in species like lampreys and Pacific salmon.
  • Long-lived fish species with indeterminate growth are hypothesized to experience very slow or negligible senescence.

Purpose of the Study:

  • To review the different types of senescence observed in fish species.
  • To highlight the known mechanisms and evidence for senescence in fish.
  • To identify knowledge gaps regarding senescence in long-lived fish.

Main Methods:

  • Review of existing literature on fish senescence.
  • Analysis of anatomical, cellular, and biochemical markers of aging in fish.

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  • Examination of factors influencing senescence, such as diet and environment.

    • Main Results:

    • Three senescence patterns identified: rapid (lampreys, salmon), gradual (guppy, medaka), and slow/negligible (sturgeons, flatfish).
    • Gradual senescence shows age-related increases in mortality, lipofuscin accumulation, and decreased reproductive capacity.
    • Dietary restriction and lower temperatures can retard aging in some gradual-senescence species.

    Conclusions:

    • Evidence suggests commonalities in aging mechanisms across vertebrates, particularly in species with gradual senescence.
    • Neuroendocrine mechanisms are implicated in rapid senescence.
    • Further research is crucial to understand senescence in long-lived fish due to a lack of current data.