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Effect of elevated summer temperatures on gonadal steroid production, vitellogenesis and egg quality in female Atlantic salmon

Citation

King, HR and Pankhurst, NW and Watts, M and Pankhurst, PM, Effect of elevated summer temperatures on gonadal steroid production, vitellogenesis and egg quality in female Atlantic salmon, Journal of Fish Biology, 63, (1) pp. 153-167. ISSN 0022-1112 (2003) [Refereed Article]

DOI: doi:10.1046/j.1095-8649.2003.00137.x

Abstract

Groups of Tasmanian female Atlantic salmon Salmo salar L. were maintained at 14, 18 and 22° C for 3 months from mid-summer (January). Blood plasma levels of 17β-oestradiol (E2), testosterone (T), cortisol and vitellogenin (Vtg) were measured at regular intervals, and in autumn (April) temperatures were reduced to 8° C to facilitate spawning and egg incubation. Maintenance at 22° C during vitellogenesis was associated with a general reduction in plasma E2 levels and an early reduction in plasma Vtg levels relative to those observed in fish held at 14 and 18° C. Significantly reduced oocyte diameters in ova from fish held at 22° C (5.4 mm cf. 5.7 mm) confirmed reduced maternal investment, and an increase in the incidence of previously undescribed chorion damage suggested that zonagenesis may also have been impaired. As a result, the fertility and survival of ova from fish exposed to 22° C (69 and 42%, respectively) were significantly reduced relative to those of ova from fish maintained at 14° C (93 and 86%) and 18° C (86 and 84%). © 2003 The Fisheries Society of the British Isles.

Item Details

Item Type:Refereed Article
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:Fisheries - Aquaculture not elsewhere classified
Author:Pankhurst, NW (Professor Ned Pankhurst)
Author:Watts, M (Dr Marianne Watts)
Author:Pankhurst, PM (Dr Tish Pankhurst)
ID Code:27371
Year Published:2003
Web of Science® Times Cited:56
Deposited By:TAFI - Aquaculture
Deposited On:2003-08-01
Last Modified:2004-03-29
Downloads:0

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