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Related Experiment Videos

Aglomerularism in Antarctic fish.

G H Dobbs, Y Lin, A L DeVries

    Science (New York, N.Y.)
    |August 30, 1974
    PubMed
    Summary
    This summary is machine-generated.

    Antarctic bony fish form urine without glomerular filtration, a process called aglomerularism. This kidney adaptation likely prevents the loss of essential biological antifreeze proteins.

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    Area of Science:

    • Physiology
    • Zoology
    • Marine Biology

    Background:

    • Antarctic bony fish inhabit extreme cold environments.
    • Kidney function is crucial for osmoregulation and waste excretion in vertebrates.

    Purpose of the Study:

    • To investigate the mechanism of urine formation in Antarctic bony fish.
    • To determine if glomerular filtration occurs in the kidneys of these fish.

    Main Methods:

    • Light microscopy of serial kidney sections.
    • Measurement of carbon-14 labeled inulin excretion after caudal vein injection.

    Main Results:

    • Direct observation confirmed the absence of glomeruli in the fish kidneys.
    • Low concentrations of excreted inulin indicated a lack of glomerular filtration.

    Conclusions:

    • Antarctic bony fish possess aglomerular kidneys.
    • Aglomerularism is likely an adaptation to prevent the loss of vital antifreeze glycoproteins.