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Gonadal differentiation in coho salmon, Oncorhynchus kisutch, after a single treatment with androgen or estrogen at different stages during ontogenesis

AutorPiferrer, Francesc ; Donaldson, Edward M.
Fecha de publicaciónmar-1989
CitaciónAquaculture 77(2-3): 251-262 (1989)
ResumenThe labile period for hormonal treatment for purposes of controlling sexual differentiation in coho salmon was deternined by administration of estradiol-17β (E2) and 17α-methyltestosterone (MT) through immersion for 2 h at a concentration of 400 μg/l, to groups of coho salmon sampled weekly from the late eyed-egg stage until the third week of feeding. Histological samples of the gonadal region were prepared from a control group at each weekly treatment interval using a plastic embedding process. It was found that a single estrogen treatment significantly increased the proportion of phenotypic females when administered between 8 days pre-hatch and 13 days post-hatch, while a single androgen treatment significantly increased the proportion of phenotypic males when administered between 6 and 13 days post-hatch. The maximum response for E2-treated groups (84% females) occurred as a result of treatment 1 day before 50% hatch while the maximum response for MT-treated groups (73.1% males) occurred as a result of treatment 1 week later. Thus, the labile period during which the fish were able to respond to a single administration of exogenous steroid was determined to last 3 weeks, and coincided with the time of hatching and the first days of the alevin stage. Sexual differentiation was first observed at 27 days post-hatching, 21–28 days after the time of maximum steroid sensitivity and coinciding approximately with the time of first feeding.
Descripción12 pages, 2 figures, 1 table.-- Reported in part at the Third International Symposium on Reproductive Physiology of Fish, St. John's, Newfoundland, Canada, 2–9 August 1987.
Versión del editorhttp://dx.doi.org/10.1016/0044-8486(89)90207-X
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