Effects of GnRHa treatment during vitellogenesis on the reproductive physiology of thermally challenged female Atlantic salmon (Salmo salar)
| Autor: | Abigail Elizur, Kelli Anderson, H.R. King, Ned William Pankhurst |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
medicine.medical_specialty Atlantic salmon Gonadotropin releasing hormone medicine.medical_treatment media_common.quotation_subject lcsh:Medicine Broodstock Gonadotropin-releasing hormone Biology General Biochemistry Genetics and Molecular Biology 03 medical and health sciences Follicle-stimulating hormone Vitellogenin Internal medicine medicine Ovulation Molecular Biology Gonadotropin-releasing hormone analogue media_common General Neuroscience Reproduction lcsh:R Temperature 04 agricultural and veterinary sciences General Medicine 030104 developmental biology Endocrinology Fertility 040102 fisheries biology.protein Aquaculture Fisheries and Fish Science 0401 agriculture forestry and fisheries Vitellogenesis Gene expression General Agricultural and Biological Sciences Hormone |
| Zdroj: | PeerJ, Vol 5, p e3898 (2017) PeerJ |
| ISSN: | 2167-8359 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|