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Physiological stress responses to confinement in diploid and triploid Atlantic salmon


Sadler, J and Pankhurst, NW and Pankhurst, PM and King, HR, Physiological stress responses to confinement in diploid and triploid Atlantic salmon, Journal of Fish Biology, 56, (3) pp. 506-518. ISSN 0022-1112 (2000) [Refereed Article]

DOI: doi:10.1111/j.1095-8649.2000.tb00751.x


Confinement of juvenile Atlantic salmon Salmo salar from four different populations (all-female diploids, all-female triploids, mixed sex diploids and mixed sex triploids) either before (FW parr) or after (SW smolts) transfer to sea elevated plasma cortisol and plasma lactate from control levels irrespective of ploidy status. Both before and after confinement, plasma cortisol levels in SW smolts (6-174 ng ml-1) were higher than those in FW parr (4-58 ng ml-1), which possibly reflected the physiological challenge of acclimation to SW. Mixed sex populations of SW smolts had higher cortisol levels than all-female populations. The duration of confinement (1, 3 or 6 h) affected the magnitude of the plasma cortisol and lactate responses in SW smolts. Plasma cortisol levels in diploid and triploid SW smolts subjected to 2 h of confinement decreased to pre-stress levels within 6 h post-confinement. Plasma lactate levels were not significantly different from pre-stress levels 48 h after confinement. As no difference exists in primary and secondary stress responses of Atlantic salmon of differing ploidy status, it is unlikely that differences in mortality rates between diploid and triploid populations under commercial conditions can be attributed to differences in their physiological responses to periods of stress lasting up to 6 h. (C) 2000 The Fisheries Society of the British Isles.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food 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
UTAS Author:Sadler, J (Dr Joanne Sadler)
UTAS Author:Pankhurst, NW (Professor Ned Pankhurst)
UTAS Author:Pankhurst, PM (Dr Tish Pankhurst)
ID Code:18397
Year Published:2000
Web of Science® Times Cited:51
Deposited By:TAFI - Aquaculture
Deposited On:2000-08-01
Last Modified:2011-11-07

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