Plasma oestrogen levels in rainbow trout Salmo gairdneri Richardson |
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| Authors: | Carl B. Schreck Robert T. Lackey M. Lloyd Hopwood |
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| Affiliation: | Colorado Cooperative Fishery Unit, Colorado State University, Fort Collins, Colorado 80521, U.S.A.;Division of Forestry and Wildlife Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, U.S.A.;Department of Physiology and Biophysics, Colorado State University, Fort Collins, Colorado 80521, U.S.A. |
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| Abstract: | Levels of oestrogens in plasma of mature fall-spawning rainbow trout Salmo gairdneri were determined using a radio-immunoassay. No significant difference was found in oestrogen concentration between the sexes (male =2.5 ng/ml; female =4.4 ng/ml); between individual variability was great. Four blood samplings over a 24-h period via cardiac puncture of males revealed no diel variation or change in estrogen levels due to the stress of bleedings. Although no gonado-somatic index-estrogen relationship could be demonstrated for either sex, there was correlation between oestrogen and androgen levels in the female. |
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