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The effect of salt adaptation on the permeability and cation selectivity of the goldfish intestinal epithelium

1. The short‐term uptake of Na by the goldfish mucosa was compared using both inulin and choline as markers of extracellular space. The results were virtually identical, the distribution of both choline and inulin increasing rapidly to measure a space at 1 min which then remained nearly constant during a following 4 min incubation.