Plasma oestrogen levels in rainbow trout Salmo gairdneri Richardson

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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 x̄=2.5 ng/ml; female x̄=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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