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Plasma and red cell ionic composition in rainbow trout exposed to progressive temperature increases.

A H Houston, T F Koss

    The Journal of Experimental Biology
    |May 1, 1984
    PubMed
    Summary

    Rainbow trout exposed to rising temperatures showed minimal plasma ion changes, but red blood cell ion concentrations, particularly chloride and potassium, increased significantly at higher temperatures. These changes may impact oxygen transport, though overall oxygen affinity remains stable.

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    Area of Science:

    • * Physiological and biochemical responses of aquatic organisms
    • * Environmental adaptation in fish physiology

    Background:

    • * Elevated temperatures affect fish physiology, including ion transport and blood parameters.
    • * Understanding these changes is crucial for predicting fish health in warming aquatic environments.

    Purpose of the Study:

    • * To investigate the effects of progressive temperature increases on rainbow trout physiology.
    • * To analyze changes in hemoglobin, hematocrit, and electrolyte concentrations in plasma and red blood cells.

    Main Methods:

    • * Yearling rainbow trout were exposed to temperatures ranging from 10 to 26.1°C.
    • * Measurements included plasma and erythrocytic concentrations of Na+, K+, Ca2+, Mg2+, Cl-, hemoglobin, and hematocrit.
    • * Compared to a control group maintained at 10°C.

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    Main Results:

    • * Plasma ion concentrations remained largely unaffected until acutely stressful temperatures.
    • * Hemoglobin and hematocrit showed minimal changes up to 25°C, with decreases at higher temperatures.
    • * Red blood cell Cl- and K+ increased significantly above 16-18°C, as did their ratios to hemoglobin.

    Conclusions:

    • * While plasma ions are stable, red blood cell composition changes significantly with temperature.
    • * Observed changes suggest potential impacts on hemoglobin-oxygen affinity, though P50 values show little acclimatory variation.
    • * Unidentified factors may counteract temperature-induced shifts in oxygen transport efficiency.