Journal of comparative physiology

, Volume 146, Issue 1, pp 123–127 | Cite as

Plasma cortisol measurements in precocious male and nonprecocious male juvenile steelhead trout (Salmo gairdneri)

  • Steven P. Schmidt
  • Edwin W. House
Article

Summary

The mean biweekly plasma cortisol levels of juvenile nonmigratory precocious male steelhead trout,Salmo gairdneri, maintained from June through November in our laboratory under natural photoperiodic conditions ranged from 2.4–27.2 μg/dl. Greatest mean cortisol occurred during the month of greatest gonadal mass, suggesting a direct interrenal-testicular relationship in this population of trout. The monthly mean plasma cortisol level of nonprecocious juvenile steelhead males captured prior to their downstream migration to the ocean from an Idaho hatchery and maintained in the laboratory simultaneously with the precocious males was low. For some months plasma cortisol was less than 0.1 μg/dl. In June, however, plasma cortisol in nonprecocious males was 11.0 μg/dl.

Keywords

Migration Cortisol Human Physiology Cortisol Level Plasma Cortisol 

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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Steven P. Schmidt
    • 1
  • Edwin W. House
    • 1
  1. 1.Department of BiologyIdaho State UniversityPocatelloUSA

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