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Seasonal variations in sex steroids of female rainbow trout ( Salmo gairdneri Richardson)
Author(s) -
Scott A. P.,
Bye V. J.,
Baynes S. M.
Publication year - 1980
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1980.tb02790.x
Subject(s) - rainbow trout , salmo , biology , testosterone (patch) , sexual maturity , endocrinology , medicine , ovulation , fish <actinopterygii> , seasonal breeder , fishery , calcium , zoology , hormone
17β‐oestradiol, testosterone, 11 ‐ketotestosterone and calcium were measured in plasma of female rainbow trout over the course of a single spawning season. The patterns of rise and fall of the levels of 17β‐oestradiol and calcium during sexual maturation were similar to those demonstrated by other workers. Very high levels of testosterone were found in plasma of sexually mature fish—mean level 211 ng ml‐1 in November and 115 ng ml‐1 in January. Ovulation occurred from December to February.