Journal
JOURNAL OF FISH BIOLOGY
Volume 73, Issue 10, Pages 2341-2351Publisher
WILEY
DOI: 10.1111/j.1095-8649.2008.02082.x
Keywords
aggression; conflict resolution; GH; salmonid; social interaction
Categories
Funding
- Norwegian Research Council
- Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning
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The effects of growth hormone (GH) implants on aggression, and ability to win dyadic territorial conflicts were studied in brown trout Salmo trutta parr. Bovine GH or vehicle (C) was given to either the territory owner or the intruder in four treatment combinations: C and C, C and GH, GH and C, GH and GH (owner and intruder). GH-treated intruders initiated significantly more conflicts compared to control intruders. Furthermore, GH treatment of either the owner or intruder tended to increase aggression of the intruder. This indicates that intruders have more scope for motivational increase, while the motivation of owners is already at a maximum. The GH treatment, however, did not affect the outcome of the conflict. It thus appears that growth enhancement increases intruder aggression without increasing the chance of winning the conflict, which may have implications for the effect of growth-selected or growth-enhanced farmed Atlantic salmon Salmo salar on wild populations.
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