Abstract
1. 1. Posterior gills of shore crabs Carcinus maenas acclimated to brackish water were perfused and bathed with 50% sea water or artificial salines. 2. 2. Generation of transbranchial potential differences and NaCI fluxes were reversibly inhibited by basolaterally applied chloride channel blockers (A9C, DPC, Cl 2-DPC, NPPB). 3. 3. Inhibitors depolarized the branchial cells in a sequence of potency from A9C over DPC, Cl 2-DPC to NPPB ( K i for PD=7 x 10 −6M). NPPB also depolarized the cells when applied in HCO 3 −-free or Na +free salines. 4. 4. The results obtained show the presence of a basolaterally located Cl −-channel operating in branchial ion transport.
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