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Biol Bull 124: 45-54. (February 1963)
© 1963 Marine Biological Laboratory
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CHLORIDE EXCHANGES IN RAINBOW TROUT (SALMO GAIRDNERI) ADAPTED TO DIFFERENT SALINITIES

MALCOLM S. GORDON 1

1 Department of Zoology, University of California, Los Angeles 24, California

1. Estimates of rates of exchange of body chloride, both total exchanges and exchanges across the integument and by way of the gut and kidneys, have been made in rainbow trout (Salmo gairdneri) acclimatized to various salinities between fresh water and sea water (salinity 32%). Radioactive chlorine-36 was used as a tracer of chloride movements.

2. Neither total Cl exchanges nor integumentary exchanges varied in proportion with changes in the magnitude of the transintegumentary osmotic gradients maintained by the fish. This result is interpreted as indicating that changes in the permeability to water of the integument (probably primarily the gills) are an important part of the salinity adaptation process in rainbow trout.

3. Laboratory diuresis and exchange diffusion of chloride are discussed as possible complications in this interpretation.






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Copyright © 1963 by the Marine Biological Laboratory.