Physiological aspects of NaCl movements in the gills of the euryhaline crab, Eriocheir sinensis, acclimated to fresh water

1.1. Transepithelial inward active transport of Na+ and Cl− are found in the posterior gills but not in the anterior ones.2.2. The posterior gills further show transepithelial passive movements of Cl− but not of Na+ while the anterior ones show transepithelial passive movements of Na+ and not of Cl−.3.3. In the anterior gills, the PD can be accounted for by diffusive Na+ fluxes at the aplcal side and Na+/K+ pump and leak system at the serosal …