Summary
The coronet cells of saccus vasculosus of fresh-water living and sea-water adapted rainbow trout were studied with the electron microscope, with special regard to changes in the latter group. Only quantitative differences were observed, namely a raised number of mitochondria in the apical region and the head and also a concentration of the agranular endoplasmic reticulum with a higher amount of electron-dense material and vesicles around the Golgi saccules. Together, these findings suggest a secretory function for the coronet cell. A supposed transport of vesicles from the head region of the coronet cell out into the globules is suggested. Interrelation between primary and secondary vesicles is discussed.
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This work was supported by grants from the Royal Physiographical Society of Lund and the Faculty of Natural Sciences at the University of Lund.—I am greatly indebted to Mrs. Lena Svenre and Miss Inger Norling for excellent technical assistance.
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von Mecklenburg, C. Ultrastructural changes in the coronet cells of the saccus vasculosus from rainbow trout, Salmo gairdneri (Richardson), kept in sea water. Z.Zellforsch 139, 271–284 (1973). https://doi.org/10.1007/BF00306526
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DOI: https://doi.org/10.1007/BF00306526