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Time course of osmotic adaptation and gill energetics of rainbow trout (Salmo gairdneri R.) following abrupt changes in external salinity

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Summary

The physiological and biochemical responses of rainbow trout (mean weight 250 g) to abrupt increases in salinity have been investigated. An initial ‘crisis’ period lasting about 30 h was characterized by an increase in plasma and muscle ions, a rapid gill dehydration and a pronounced acidosis following a transient alkalosis. Mortality was low during this period. During the following days, gradual changes resulted in new steady state levels for most parameters examined.

Analysis of adenylate pool (ATP, ATP/ADP ratio and energy charge) in the gills demonstrated an increased energy demand exhibiting two phases (4 h and 3 days), and a return to freshwater values. The gill respiration rate was constant during 3 days in sea water and decreased slightly later on. It was not influenced during the reverse transfer of seawater adapted fish into fresh water at the level of either isolated gills or perfused heads.

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Authors and Affiliations

  1. Laboratoire de Physiologie Comparée des Régulations, C.N.R.S., B.P. 20 CR, F-67037, Strasbourg-Cédex, France

    C. Leray, D. A. Colin & A. Florentz

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  1. C. Leray
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  2. D. A. Colin
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  3. A. Florentz
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Leray, C., Colin, D.A. & Florentz, A. Time course of osmotic adaptation and gill energetics of rainbow trout (Salmo gairdneri R.) following abrupt changes in external salinity. J Comp Physiol B 144, 175–181 (1981). https://doi.org/10.1007/BF00802755

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