Influence of Photoperiod on the Number and Ultrastructure of Gill Chloride Cells of the Atlantic Salmon ( Salmo salar ) before and during Smoltification

Atlantic salmon (Salmo salar) larger than 9 cm held under constant light since October had greater numbers of gill chloride cells in February compared with fish held under simulated natural photoperiod. By April, fish raised under simulated natural photoperiod were able to survive salinity tests, ha...

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Bibliographic Details
Published in:Canadian Journal of Fisheries and Aquatic Sciences
Main Authors: Lubin, Robert T., Rourke, A. W., Saunders, Richard L.
Format: Article in Journal/Newspaper
Language:English
Published: Canadian Science Publishing 1991
Subjects:
Aquatic Science
Ecology, Evolution, Behavior and Systematics
Atlantic salmon
Salmo salar
Online Access:http://dx.doi.org/10.1139/f91-156
http://www.nrcresearchpress.com/doi/pdf/10.1139/f91-156
Description
Summary:Atlantic salmon (Salmo salar) larger than 9 cm held under constant light since October had greater numbers of gill chloride cells in February compared with fish held under simulated natural photoperiod. By April, fish raised under simulated natural photoperiod were able to survive salinity tests, had a threefold increase in Na + /K + ATPase activity, and had increased chloride cell numbers. These increases and salinity tolerance did not occur in fish raised under constant light. Only fish reared under constant light developed apical pits with large and numerous microvilli.

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