Intestinal salt and water transport in a euryhaline teleost, Aphanius dispar (Cyprinodontidae)

Abstract

1. 1. The transmural Na +, K +, Cl − and water flow in the total intestine of Aphanius dispar was measured by an in vitro in situ perfusion technique. 2. 2. A neutral NaCl absorption without a net K + flow was observed; this occurred in the absence of a transmural osmotic difference followed by an isosmotic water absorption. 3. 3. The osmotic permeability coefficient and the NaCl mobility of the intestinal wall seemed high.