Changes in the pituitary of the migrating European eel during its journey from rivers to the sea |
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| Authors: | Sir Francis Knowles Lutz Vollrath |
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| Institution: | (1) Department of Anatomy, Medical School, University of Birmingham, England;(2) Anatomisches Institut der Universität Würzburg, Germany |
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| Abstract: | Summary The present studies demonstrate that, as migrating European silver eels enter the sea, important changes occur in the pars distalis of the pituitary. A decrease of Type A neurosecretory material in all nerve tracts penetrating the pars distalis was observed, as was an increased activity of Type B neurosecretion in the tracts of the proximal pars distalis.In the proximal pars distalis, gonadotropic cells show striking changes, and in the rostral pars distalis thyrotropic and  prolactin cells. It is discussed whether these changes are related to migration to breeding grounds or to changes in the environment.Dedicated to Dr. Berta Scharrer on her 60th birthday. |
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