Effects of stripping of the outer layers of the eel intestine on salt and water transport

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Abstract 1. 1. The outer layers of the eel intestine were stripped off and the electrical potential difference (PD) and net water flux across the stripped intestine were measured. 2. 2. The PD of serosa-negativity in the stripped intestine was 4 times higher than that in the intact one. 3. 3. The high serosa-negative potential was dependent on Cl − in the fluids, demonstrating the presence of a Cl − pump. 4. 4. When Na + transport was inhibited by either replacement of Na + with other cations or additions of ouabain, the high serosa-negative potential was reduced to zero. 5. 5. The results were discussed in relation to Cl − pump-Na + pump coupling and to sea-water adaptation of the eels.

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