Differentiation of the chloride extrusion mechanism during sea water adaptation of a teleost fish the cichlid sarotherodon mossambicus

Foskett, J.K.; Logsdon, C.D.; Turner, T.; Machen, T.E.; Bern, H.A.

Journal of Experimental Biology 93: 209-224


ISSN/ISBN: 0022-0949
Accession: 005159907

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Opercular membranes isolated from the euryhaline teleost, S. mossambicus, was used to follow the development of the branchial salt extrusion mechanism. Following transfer to seawater, non-transporting membranes characteristic of freshwater fish differentiate into membranes capable of high rates of Cl secretion, the full development of which requires 1-2 wk. This time course provides the 1st unambiguous measurement of changes in net extrarenal salt secretion associated with a teleost's seawater adaptation. Electrophysiological and morphological data indicate that development of salt extrusion involves increased numbers (controlled, in part, by cortisol) and differentiation of chloride cells, including activation of membrane active-transport sites.