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Biol Bull 134: 74-86. (February 1968)
© 1968 Marine Biological Laboratory
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THE EFFECTS OF LOW TEMPERATURE, AND CORTISOL, ON TESTICULAR REGRESSION IN THE HYPOPHYSECTOMIZED CYPRINODONT FISH, FUNDULUS HETEROCLITUS

BRIAN LOFTS 1, GRACE E. PICKFORD 2, and JAMES W. ATZ 3

1 Department of Zoology and Comparative Anatomy, St. Bartholomew's Hospital Medical College, University of London
2 Department of Biology, The Bingham Laboratory, Yale University, New Haven, Connecticut 06520
3 Department of Ichthyology, The American Museum of Natural History, New York, New York 10024

1. Low temperature retarded the rate of sexual regression in hypophysectomized male Fundulus heteroclitus.

2. Transfer to warm temperature accelerated the rate of post-spermatogonial regression, and the partially regressed interstitial tissue became inactive.

3. In contrast, the return to warm temperature stimulated the rate of spermatogonial mitosis. It is suggested that temperature has a direct action on spermatogonial multiplication.

4. Cortisol, at a physiological dose, had no significant effect on the condition of the testes.






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Copyright © 1968 by the Marine Biological Laboratory.