sex differentiation; sex reversal; tilapia; aggressive behaviour; androgen; oestrogen
Abstract :
[en] In Nile tilapia Oreochromis niloticus, phenotypic males and females with different sexual genotypes (XX, XY, YY) have particular behavioural and physiological traits. Compared to natural XX females and XY males, XY and YY females, and XX males expressed higher level of aggressiveness that could be related to higher levels of 17β-oestradiol and 11-ketotestosterone respectively. Our results suggest that the presence of a Y chromosome increases aggressiveness in females. However, since the same relationship between aggressiveness and the Y chromosome is not observed in males, we can hypothesize that the differences in aggressiveness are not directly dependent on the genotype but on the sex reversal procedures applied on young fry during their sexual differentiation to produce these breeders. These hormonal treatments could have permanently modified the development of the brain and consequently influenced the behaviour of adults independently of their genotype. In both hypotheses (genotype or sex reversal influence), the causes of behavioural modifications have to be searched in an early modification of the brain sexual differentiation.
Disciplines :
Zoology
Author, co-author :
Gennotte, Vincent ; Université de Liège > Centre de formation et de recherche en aquaculture (CEFRA)
Akonkwa, Balagizi; Official University of Bukavu > Laboratory of Hydrobiology
Mélard, Charles ; Université de Liège > Centre de formation et de recherche en aquaculture (CEFRA)
Denoël, Mathieu ; Université de Liège > Département de Biologie, Ecologie et Evolution > Biologie du comportement - Ethologie et psychologie animale
Cornil, Charlotte ; Université de Liège > Département des sciences biomédicales et précliniques > Biologie de la différenciation sexuelle du cerveau
Rougeot, Carole ; Université de Liège > Centre de formation et de recherche en aquaculture (CEFRA)
Language :
English
Title :
Do sex reversal procedures differentially affect agonistic behaviors and sex steroid levels depending on the sexual genotype in Nile tilapia?
Publication date :
2017
Journal title :
Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology
ISSN :
1932-5223
eISSN :
1932-5231
Publisher :
John Wiley & Sons, Hoboken, United States - New Jersey
Volume :
327
Issue :
4
Pages :
153-162
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE] Académie de Recherche et d'Enseignement Supérieur (Belgique). Coopération au Développement - ARES. CCD
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