The urinary flow inCrangon vulgaris(Fabr.) (Crustacea, natantia) during the moult cycle

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Abstract
The urinary flow, measured as changes in medium conductivity, was investigated during the moult cycle of Crangon vulgaris living in 10%0 at 20.5 °C. The urination frequency in an intermoult animal was once per 50-55 minutes, while the frequency in the early postmoultincreased to once per 15-20 minutes. A continous recording of the urination frequency during the moult showed a decrease in late pre moult from the intermoult values to once per 60-80 minutes. Together with a fall in urine production this indicates that part of the increase in water content prior to ecdysis is caused by decreasing diuresis. The urine production in the intermoult was found to be around 20 μl · g-1 · h-1. After the moult the production increased to 50-60 μl · g-1 · h-1. The changes in diuresis are interpreted as changes in water fluxes due to, among other factors, changes in surface permeability.