LEAP received a nice Saint-Nicolas present from FNRS with a grant for a research project entitled “The epigenetic origin of behavioral traits variability in a self-fertilizing fish: the mangrove rivulus”. One of the greatest challenges in evolutionary biology is to determine how epigenetic mechanisms contribute to phenotypic variability, on which selection can act. The general objective of the present project is to explore the extent to which epigenetic polymorphism contributes to repeatable and predictable among-individual differences in behaviour (individuality) in the self-fertilizing fish mangrove rivulus, Kryptolebias marmoratus. It is intimately linked to Valentine Chapelle thesis project.