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Effects of GnRHa treatment during vitellogenesis on the reproductive physiology of thermally challenged female Atlantic salmon (Salmo salar)

Citation

Anderson, K and Pankhurst, N and King, H and Elizur, A, Effects of GnRHa treatment during vitellogenesis on the reproductive physiology of thermally challenged female Atlantic salmon (Salmo salar), PeerJ, 5 Article e3898. ISSN 2167-8359 (2017) [Refereed Article]


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DOI: doi:10.7717/peerj.3898

Abstract

Tasmanian Atlantic salmon (S. salar) broodstock can experience temperatures above 20 C, which impairs reproductive development and inhibits ovulation. The present study investigated the prolonged use of gonadotropin releasing hormone analogue (GnRHa) during vitellogenesis as a means of maintaining endocrine function and promoting egg quality at elevated temperature in maiden and repeat spawning S. salar. GnRHa-treatment during vitellogenesis did not compensate for the negative effects of thermal challenge on the timing of ovulation, egg size, egg fertility or embryo survival in any fish maintained at 22 C relative to 14 C. The lack of effectiveness was reflected by the endocrine data, as plasma follicle stimulating hormone and luteinising hormone levels were not different between treated and untreated groups at 22 C. Furthermore, plasma testosterone and E2 levels were unchanged in GnRHa-treated fish at 22 C, and plasma levels were generally lower in both groups maintained at 22 C relative to 14 C. Transcription of vitellogenin, and zona pellucida B and C was not enhanced in GnRHa-treated fish relative to untreated fish at 22 C, presumably due to observed suppression of plasma E2. These results indicate that thermal impairment of reproduction is likely to occur on multiple levels, and is difficult to overcome via hormonal manipulation.

Item Details

Item Type:Refereed Article
Keywords:temperature, Atlantic salmon, fertility, gene expression, reproduction, gonadotropin releasing hormone
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Aquaculture Fin Fish (excl. Tuna)
Author:Anderson, K (Miss Kelli Anderson)
ID Code:127614
Year Published:2017
Deposited By:Fisheries and Aquaculture
Deposited On:2018-08-06
Last Modified:2018-08-06
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