QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by LANDGREBE, F. W. Search for Related Content PubMed Articles by LANDGREBE, F. W.

Journal of Experimental Biology 18,162-169 (1941)
Published by Company of Biologists 1941

The Role of the Pituitary and the Thyroid in the Development of Teleosts

F. W. LANDGREBE ¹

¹ Department of Natural History, University of Aberdeen

1. There is no satisfactory evidence for regarding the organ of Syrski as the male gonad of Anguilla.

2. Silvering of the eel, salmon and trout is independent of gonad development and cannot therefore be regarded as a ‘breeding dress’.

3. Injection of either pregnancy urine, ox anterior lobe extracts, pig anterior lobe extracts and thyroid extracts, as also pituitary homeo-implantation, were all without effect on the gonads of eels treated in this way.

4. Ox anterior lobe extracts produced premature smoltification in Salmo salar, had no visible effect on S. trutta or on Anguilla vulgaris, and did not affect the gonads in either species.

5. Injection of thyroid extracts produced silvering in salmon and brown trout but had no effect on the eel.

6. After two months' treatment with thyroid extract brown trout are externally indistinguishable from sea trout.