Indicators of reproductive performance in rainbow trout Oncorhynchus mykiss (Walbaum) selected for high and low responsiveness to stress

Pottinger, T.G.; Carrick, T.R.. 2000 Indicators of reproductive performance in rainbow trout Oncorhynchus mykiss (Walbaum) selected for high and low responsiveness to stress. Aquaculture Research, 31 (4). 367-375.

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A number of indicators of reproductive performance were assessed in rainbow trout divergently selected on the basis of their plasma cortisol response to a standardised stressor. For both male and female rainbow trout, body weight was significantly related to stress responsiveness. High-responding (HR) females were significantly heavier than low-responding (LR) females overall and HR males were significantly heavier than LR males overall. There was no significant difference in the SGR of HR and LR female fish during the experimental period while in contrast the mean SGR of HR males was significantly greater than that of LR males. The divergent confinement-induced levels of blood cortisol in HR and LR groups were stable for more than one year after selection. There was no significant difference in the extent to which confinement stress reduced blood estradiol-17 levels in HR and LR females despite the large difference in relative blood cortisol levels. The onset and rate of ovulation was similar within the HR and LR groups. Differences in fecundity, relative fecundity and egg volume and weight were wholly attributable to the different mean body weights of the HR and LR fish. There was no difference between the sperm counts of HR and LR males. There was significantly higher mortality among eggs derived from HR parents overall between fertilization and hatch but maximum mean mortality did not exceed 12%. Mean time to eyeing in the HR groups was 224 degree days and in the LR groups was 244 degree days. Hatching commenced at 344 and 347 degree days in the HR and LR groups respectively and was complete within 412 and 416 degree days respectively. Overall, selection for stress responsiveness was associated with no significant benefits or costs in reproductive performance.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Programmes pre-2009 publications > Other
UKCEH and CEH Sections/Science Areas: _ Pre-2000 sections
ISSN: 1355-557X
Additional Information. Not used in RCUK Gateway to Research.: NOTICE: This document is the author’s final manuscript version of the journal article, incorporating any revisions agreed during the peer review process. Some differences between this and the publisher’s version remain. You are advised to consult the publisher’s version if you wish to cite from this article. The definitive version is available at
Additional Keywords: rainbow trout, selective breeding, reproduction, cortisol, estradiol, stress response, egg size, sperm count, aquaculture
NORA Subject Terms: Zoology
Biology and Microbiology
Date made live: 06 Jul 2015 11:17 +0 (UTC)

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