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Related Experiment Videos

Scope for activity in the crayfish Pacifastacus leniusculus

P S Rutledge, A W Pritchard

    The American Journal of Physiology
    |January 1, 1981
    PubMed
    Summary
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    The noble crayfish (Pacifastacus leniusculus) exhibits significant oxygen uptake ability, with optimal activity and metabolic scope at 20°C. Its oxygen consumption rates are comparable to active fish species.

    Area of Science:

    • Crustacean physiology
    • Environmental toxicology
    • Aquatic animal metabolism

    Background:

    • Understanding the metabolic scope of aquatic invertebrates is crucial for predicting their response to environmental changes.
    • Pacifastacus leniusculus, a widely distributed decapod crustacean, serves as a model organism for studying physiological adaptations.

    Purpose of the Study:

    • To determine the thermal tolerance and metabolic scope for activity in Pacifastacus leniusculus.
    • To compare the oxygen consumption rates of crayfish with those of various fish species across a range of temperatures.

    Main Methods:

    • Measurement of standard and active oxygen consumption rates (VO2) at different temperatures (5-30°C).
    • Determination of the incipient lethal temperature.
    • Calculation of the scope for activity (Active VO2 - Standard VO2).

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    Main Results:

    • The incipient lethal temperature for Pacifastacus leniusculus was 33°C.
    • Standard oxygen consumption increased with temperature (Q10 = 2.09).
    • Active oxygen consumption and scope for activity peaked at 20°C, with values comparable to moderately active fish species.

    Conclusions:

    • Pacifastacus leniusculus possesses a well-developed oxygen uptake ability, with a broad thermal tolerance range.
    • The metabolic scope of crayfish at optimal temperatures is significant when compared to various fish species.
    • These findings highlight the physiological capacity of crayfish to thrive in fluctuating aquatic environments.