Effect of elevated temperature on estrogenic induction of vitellogenesis and zonagenesis in juvenile Atlantic salmon ( Salmo salar )

Fertility and embryo survival rates are often low in eggs from thermally challenged Tasmanian Atlantic salmon, partly due to a reduction in plasma 17β-estradiol (E 2 ) levels. We used juvenile Atlantic salmon to assess whether hepatic tissue remains responsive to stimulation by E 2 at the higher tem...

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Bibliographic Details
Published in:Marine and Freshwater Behaviour and Physiology
Main Authors: Anderson, K, King, H, Pankhurst, N, Ruff, N, Pankhurst, P, Elizur, A
Format: Article in Journal/Newspaper
Language:English
Published: Taylor and Francis 2012
Subjects:
Agricultural and Veterinary Sciences
Fisheries Sciences
Aquaculture
Atlantic salmon
Salmo salar
Online Access:https://doi.org/10.1080/10236244.2012.670472
http://ecite.utas.edu.au/127617
Description
Summary:Fertility and embryo survival rates are often low in eggs from thermally challenged Tasmanian Atlantic salmon, partly due to a reduction in plasma 17β-estradiol (E 2 ) levels. We used juvenile Atlantic salmon to assess whether hepatic tissue remains responsive to stimulation by E 2 at the higher temperatures sometimes encountered by Tasmanian salmon during summer. E 2 administration stimulated vitellogenin (Vtg) and estrogen receptor alpha transcription at 14C and 22C, although induction of Vtg occurred more rapidly at 22C. Consequently, plasma Vtg levels increased and reached a plateau more quickly at 22C. Zona pellucida (Zp) B and C transcription was significantly lower in E 2 -treated fish at 22C relative to 14C. This shows that the Vtg gene is E 2 -responsive at high temperature unlike Zp B and C genes that displayed traits of thermal inhibition. Therefore, estrogen replacement therapy in adult salmon may offset some, but not all thermal inhibition of reproductive function.

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