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Growth hormone affects behaviour of wild brown trout Salmo trutta in territorial owner–intruder conflicts

Artikel i vetenskaplig tidskrift
Författare Lena Neregård
L Sundt-Hansen
Björn Thrandur Björnsson
Jörgen I Johnsson
Publicerad i Journal of Fish Biology
Volym 73
Nummer/häfte 10
Sidor 2341-2351
ISSN 1095-8649
Publiceringsår 2008
Publicerad vid Zoologiska institutionen, ekologisk zoologi
Zoologiska institutionen
Sidor 2341-2351
Språk en
Länkar dx.doi.org/10.1111/j.1095-8649.2008...
Ämnesord aggression, conflict resolution, GH, salmonid, social interaction
Ämneskategorier Biologiska vetenskaper, Zoofysiologi, Etologi och beteendeekologi

Sammanfattning

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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