Abstract

Abstract o 1. The state of chloride cells has been studied at different stages of salmon life cycle. The action of succinic dehydrogenase was used as a criterion of the cells state. 2. In non-migratory salmon in fresh water (juveniles and spawners, both precocious and diadromous) chloride cells exhibit the same activity. The active state of chloride cells in feeding salmons from the sea with a 6‰ salinity is lower than in freshwater fish, which is accounted for by osmoregulation in brackish water. 3. Smolt transformation resulted in an increase of the activity of chloride cells which is likely to reflect rearrangements of osmoregulation mechanisms for functioning in hypertonic salt water.

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