Summary
Oxygen consumption and ammonia excretion were measured simultaneously in 25 individual shrimps (C. crangon) every two days during a 30-day imposed starvation.
The first response to starvation was a 10% decrease in O2 consumption and a 25% decrease in ammonia excretion. Following this, O2 consumption decreased sharply while ammonia excretion tended to rise. From the 14th day until the end of the experiment, the rates of each remained steady, the respiratory rate being about 60% below and rate of excretion about 30% above control values.
From the O:N ratio it appeared that carbohydrate reserves were quickly exhausted (3–4 days) and that lipids and proteins were the main substrates oxidized to meet the energetic requirements ofC. crangon. After 2 weeks of starvation the O:N ratio remained constant near a value of 8, indicating that only proteins were being utilised; a 50% loss of body protein after 30 days suggested that structural proteins were heavily catabolized. The meatabolic response ofCrangon to starvation (although seasonal variations must be considered) appears to depend mainly on high nitrogen requirements.
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Regnault, M. Respiration and ammonia excretion of the shrimpCrangon crangon L.: Metabolic response to prolonged starvation. J Comp Physiol B 141, 549–555 (1981). https://doi.org/10.1007/BF01101478
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DOI: https://doi.org/10.1007/BF01101478