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Endocrine Aspects of Salmonid Culture*

Published online by Cambridge University Press:  05 December 2011

T. H. Simpson
T. H. Simpson
Affiliation:
Marine Laboratory, Aberdeen.
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Synopsis

Administration, by dietary supplement, of ethylestrenol to rainbow trout and to salmon parr results in significant increases in growth rate; further treatment of smolts retained in fresh water reduces the growth rate. Treated parr develop into 1 + smolts in significantly lower proportion than controls, but have a higher condition factor.

Stress induces in rainbow trout long-lasting reductions in plasma thyroxine levels and increases in serum cortisol concentrations. The origin and significance of these changes is discussed.

The administration of 17β-oestradiol at 20 mg/kg of food for the first 30 days of feeding causes sex-reversal of male salmonids. Treatment with 17α-methyltestosterone at 3 mg/kg food for 90 days following first-feeding causes sex-reversal of female salmonids.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 75 , Issue 4: Fish Farming: Scientific and Technical Aspects , 1976 , pp. 241 - 252
Copyright
Copyright © Royal Society of Edinburgh 1976

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References

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