Relationships between circulating androgens,aggressive behaviour and breeding tubercles in males of the common bream <Emphasis Type="Italic">Abramis brama</Emphasis> L. in an aquarium environment |
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| Authors: | Email author" target="_blank">P?PoncinEmail author B?Nzau?Matondo C?Termol P?Kestemont J?C?Philippart |
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| Institution: | 1.Biology of Behaviour Unit, Laboratory of Fish Ethology,University of Liège,Liège,Belgium;2.Biology of Behaviour Unit, Laboratory of Fish Demography and Hydroecology,University of Liège,Tihange,Belgium;3.Unit of Research in Organism Biology,University of Namur,Namur,Belgium |
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| Abstract: | In this study, relationships between circulating androgens, aggressive behaviour and breeding tubercles in males of common
bream Abramis brama were examined in an aquarium environment. The breeding tubercles of fish were counted, the number of attacks was quantified
by male status and circulating rates of testosterone and 11-ketotestosterone from blood plasma were analysed using radioimmunoassay
procedures. The results revealed that no significant differences were found between circulating testosterone and 11-ketotestosterone
in territorial and nonterritorial males. Furthermore, no significant correlations were found between circulating androgens,
androgens and aggression, androgens and tubercles and breeding tubercles and aggression in common bream by male status. However,
territorial fish displayed a significantly higher level of aggressive behaviour and breeding tubercles than nonterritorial
fish. In natural environments, the occurrence of breeding tubercles during the spawning season could contribute to identifying
the behavioural status of common bream males. |
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