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Tolerance and ultrastructural responses of branchial chloride cells to salinity changes in the euryhaline teleost Oreochromis mossambicus

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Abstract

The changes of intercellular organization and junctional structures in branchial chloride cells reflect respective functions in different salinities. Under TEM, leaky junctions and intercellular digitations occurred between branchial chloride cells of Oreochromis mossambicus Peters adapted to seawater, but not in those adapted to freshwater. The fish transferred directly to 30‰ S seawater from freshwater died within 6 h, and their chloride cells developed neither leaky junctions nor interdigitations. The fishes acclimated to 20‰ S seawater for 12 h did not develop the characteristics of seawater-adapted chloride cells and died after transfer to 30‰ S seawater. The fish acclimated to 20‰ S seawater for 24 h started to develop seawater-adapted chloride cells, and were able to survive when transferred to 30‰ S seawater. Thus, the development of leaky junctions and interdigitations in branchial chloride cells appears to correlate to seawater adaptation in O. mossambicus. These changes of seawater-adapted chloride cells seem to be associated with the increase of ion permeability in the gill of teleosts adapted to seawater rather than those adapted to freshwater.

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Communicated by M. Anraku, Tokyo

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Hwang, P.P. Tolerance and ultrastructural responses of branchial chloride cells to salinity changes in the euryhaline teleost Oreochromis mossambicus . Mar. Biol. 94, 643–649 (1987). https://doi.org/10.1007/BF00431411

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