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Journal of Experimental Biology 85,203-211 (1980)
Published by Company of Biologists 1980

Uses and Limitations of Inulin and Mannitol for Monitoring Gill Permeability Changes in the Rainbow Trout

LEONARD B. KIRSCHNER 1

1 Department of Zoology, Washington State University, Pullman, WA 99164

Inulin and mannitol are excreted at measurable rates across gills in freshwater and sea-water-adapted trout. Clearance behaviour suggests that the effluxes may reflect passive permeation, which might make such compounds suitable for monitoring permeability changes. Application of poly-L-lysine and elevation of environmental temperature made FW trout gills reversibly ‘leaky’ to Na+. Mannitol efflux paralleled that of Na+ in both experiments. However, Na+ efflux was reduced in SW trout gills, by increasing external Ca2+ and mannitol efflux was unchanged. The data suggest that these nonelectrolytes can be used to assess permeability changes that do not involve highly selective ionic channels.

Submitted on May 25, 1979






© The Company of Biologists Ltd 1980