Size heterogeneity can reduce aggression and promote growth in Atlantic salmon parr |
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| Authors: | Colin Adams Felicity Huntingford Jimmy Turnbull Steve Arnott Aly Bell |
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| Institution: | (1) Fish Biology Group, University Field Station, University of Glasgow, Glasgow, G63 0AW, UK;(2) Fish Biology Group, Division of Evolutionary and Environmental Biology, Institute of Biological and Life Sciences, Graham Kerr Building, University of Glasgow, Glasgow, G12 8QQ, UK;(3) Institute of Aquaculture, University of Stirling, Stirling, FK9 4LA, UK |
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| Abstract: | Aggression in groups of 0+ Atlantic salmon (Salmo salar) was monitoredat weekly intervals in two tanks containing 100 fish each. Three 1 + salmonparr were added to one of these. After 5 weeks, fish weights were measuredin both tanks and the conditions reversed. At ten weeks, weights of fish inboth tanks were measured again. In both populations, levels of aggressionamong the smaller fish were significantly lower and growth ratessignificantly higher when the large fish were present. Although the largefish attacked the small ones, the rate at which they did so was an order ofmagnitude lower that the rate at which small fish attacked each other in theabsence of larger conspecifics. This raises the possibility that levels ofaggression among farmed salmon might be reduced by the addition of a fewlarge conspecifics. |
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| Keywords: | aggression Atlantic salmon (Salmo salar) dominance growth |
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