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  • Effect of thermal challenge on plasma gonadotropin levels and ovarian steroidogenesis in female maiden and repeat spawning Tasmanian Atlantic salmon (Salmo salar)

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    Author(s)
    Anderson, Kelli
    Swanson, Penny
    Pankhurst, Ned
    King, Harry
    Elizur, Abigail
    Griffith University Author(s)
    Pankhurst, Ned W.
    Year published
    2012
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    Abstract
    Exposure of female Atlantic salmon to elevated temperature can result in a dramatic reduction in egg fertility and embryo survival. Reductions in plasma 17߭estradiol (E2) levels are associated with much of the observed reduction in reproductive performance; however, the molecular basis for reduced E2 levels remains unknown. This study examined gene expression of ovarian steroidogenic enzymes and plasma levels of gonadotropins in maiden and repeat spawning Atlantic salmon exposed to higher than normal temperatures. Circulating levels of follicle stimulating hormone (Fsh) were significantly elevated in both maiden and repeat ...
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    Exposure of female Atlantic salmon to elevated temperature can result in a dramatic reduction in egg fertility and embryo survival. Reductions in plasma 17߭estradiol (E2) levels are associated with much of the observed reduction in reproductive performance; however, the molecular basis for reduced E2 levels remains unknown. This study examined gene expression of ovarian steroidogenic enzymes and plasma levels of gonadotropins in maiden and repeat spawning Atlantic salmon exposed to higher than normal temperatures. Circulating levels of follicle stimulating hormone (Fsh) were significantly elevated in both maiden and repeat spawning fish maintained at 22 àcompared to 14 àduring vitellogenesis, but plasma luteinising hormone levels were mostly unaffected. In contrast, gene expression of the ovarian p450 aromatase a and cholesterol side chain cleavage protein were depressed at 22 àcompared to 14 î Hepatic gene expression of estrogen receptor alpha did not change with thermal challenge. The results show that the ovarian response to Fsh is inhibited at 22 ì at least partly as a result of reduced expression of genes coding for steroidogenic enzymes.
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    Journal Title
    Aquaculture
    Volume
    334-337
    DOI
    https://doi.org/10.1016/j.aquaculture.2011.12.026
    Copyright Statement
    © 2012 Elsevier Inc. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Fish Physiology and Genetics
    Zoology
    Fisheries Sciences
    Publication URI
    http://hdl.handle.net/10072/49702
    Collection
    • Journal articles

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