Annual changes in plasma levels of cortisol and sex steroid hormones in male rainbow trout,Oncorhynchus mykiss

Hou Ya-yi; Han Xiao-dong; Suzuki Yuzuru

doi:10.1007/BF02850657

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Annual changes in plasma levels of cortisol and sex steroid hormones in male rainbow trout,Oncorhynchus mykiss

Updated：2023-05-16

- Annual changes in plasma levels of cortisol and sex steroid hormones in male rainbow trout,Oncorhynchus mykiss
- Journal of Oceanology and Limnology Vol. 19, Issue 3, Pages: 217-221(2001)
- Affiliations：
  
  1. Medical School Nanjing University
  2. Department of Aquatic Biosciences
- Author bio：
- Funds：
- DOI：10.1007/BF02850657
  CLC：
- Published：2001
- Accepted：
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Ya-yi, H., Xiao-dong, H. & Yuzuru, S. Annual changes in plasma levels of cortisol and sex steroid hormones in male rainbow trout,Oncorhynchus mykiss, ., Chin. J. Ocean. Limnol. 19, 217–221 (2001). https://doi.org/10.1007/BF02850657
DOI：

Ya-yi, H., Xiao-dong, H. & Yuzuru, S. Annual changes in plasma levels of cortisol and sex steroid hormones in male rainbow trout,Oncorhynchus mykiss, ., Chin. J. Ocean. Limnol. 19, 217–221 (2001). https://doi.org/10.1007/BF02850657 DOI：

摘要

Abstract

The profiles of cortisol

testosterone

11-ketotestosterone and 17α

20β-dihydroxy-4-pregnene-3-one in male rainbow trout reared under constant water temperature and natural photoperiod were determined by radioimmunoassay. Gonads of male rainbow trout reached maturity when the fish were two years old. Changes in the plasma levels of both sex steroid hormones and cortisol were closely related to the GSI. Plasma levels of testosterone

11-ketotestosterone and 17α; 20β-dihydroxy 4-pregnene-3-one showed a clear peak in the annual breeding season

when the GSI reached their maxima. Plasma cortisol levels also showed clearly seasonal changes in both two- and three-year-old fish. The results suggest that the elevated plasma levels of cortisol may not just be due to stresses during the breeding season but have certain physiological functions in the reproduction of rainbow trout.

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references

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