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

Kelli Anderson; P Swanson; N W Pankhurst; H R King; Abigail Elizur

doi:10.1016/j.aquaculture.2011.12.026

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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)

Journal article

Peer reviewed

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

Kelli Anderson, P Swanson, N W Pankhurst, H R King and Abigail Elizur

Aquaculture, Vol.334-337, pp.205-212

2012

DOI: https://doi.org/10.1016/j.aquaculture.2011.12.026

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Abstract

Atlantic salmon

temperature

reproduction

fertility

gonadal steroidogenesis

pituitary hormones

gene expression

Exposure of female Atlantic salmon to elevated temperature can result in a dramatic reduction in egg fertility and embryo survival. Reductions in plasma 17β-estradiol (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 °C compared to 14 °C during 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 °C compared to 14 °C. 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 °C, at least partly as a result of reduced expression of genes coding for steroidogenic enzymes.

Details

Title: Effect of thermal challenge on plasma gonadotropin levels and ovarian steroidogenesis in female maiden and repeat spawning Tasmanian Atlantic salmon (Salmo salar)
Authors: Kelli Anderson (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
P Swanson (Author) - Northwest Fisheries Science Center
N W Pankhurst (Author) - Griffith University
H R King (Author) - Salmon Enterprises of Tasmania
Abigail Elizur (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Publication details: Aquaculture, Vol.334-337, pp.205-212
Publisher: Elsevier BV
Date published: 2012
DOI: 10.1016/j.aquaculture.2011.12.026
ISSN: 0044-8486
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; Centre for Bioinnovation
Language: English
Record Identifier: 99449718502621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Fisheries; Marine & Freshwater Biology

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