Summary
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1.
The rate of sodium efflux inPotamon edulis was found to be 2.1 mM L−1hr−1. This value is intermediate between those values reported in crayfish and those of euryhaline brachyrans.
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2.
The weight specific inulin space has been compared with chloride space and calculated extracellular space. Chloride space overestimates extracellular space since the mean muscle intracellular chloride concentration is 29.4 mM kg−1. Inulin space in large individuals represents a smaller part of the body weight than in small animals.
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3.
Urine production rates, determined as inulin clearance, are slightly faster than values previously recorded for potamonids.
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4.
U/B inulin ratios rose to a mean of 2.2 within 10 d. and remained at this level. Water reabsorption by the antennl gland may account for this.
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5.
Sodium loss in the urine represents about 12% of the total measured sodium efflux.
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Harris, R.R. Urine production rate and urinary sodium loss in the freshwater crabPotamon edulis . J Comp Physiol B 96, 143–153 (1975). https://doi.org/10.1007/BF00706594
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DOI: https://doi.org/10.1007/BF00706594