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Triploidy alters brain morphology in pre-smolt Atlantic salmon Salmo salar: possible implications for behaviour
Article first published online: 16 NOV 2012
DOI: 10.1111/j.1095-8649.2012.03479.x
© 2012 The Authors. Journal of Fish Biology © 2012 The Fisheries Society of the British Isles
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How to Cite
Fraser, T. W. K., Fjelldal, P. G., Skjæraasen, J. E., Hansen, T. and Mayer, I. (2012), Triploidy alters brain morphology in pre-smolt Atlantic salmon Salmo salar: possible implications for behaviour. Journal of Fish Biology, 81: 2199–2212. doi: 10.1111/j.1095-8649.2012.03479.x
Publication History
- Issue published online: 17 DEC 2012
- Article first published online: 16 NOV 2012
- Abstract
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Keywords:
- aquaculture;
- cognition;
- cell size;
- diploid;
- sterile
Total brain mass and the volumes of five specific brain regions in diploid and triploid Atlantic salmon Salmo salar pre-smolts were measured using digital images. There were no significant differences (P > 0·05) in total brain mass when corrected for fork length, or the volumes of the optic tecta or hypothalamus when corrected for brain mass, between diploids and triploids. There was a significant effect (P < 0·01) of ploidy on the volume of the olfactory bulb, with it being 9·0% larger in diploids compared with triploids. The cerebellum and telencephalon, however, were significantly larger, 17 and 8% respectively, in triploids compared with diploids. Sex had no significant effect (P > 0·05) on total brain mass or the volumes of any measured brain region. As the olfactory bulbs, cerebellum and telencephalon are implicated in a number of functions, including foraging ability, aggression and spatial cognition, these results may explain some of the behavioural differences previously reported between diploids and triploids.