Complementary omic technologies will be employed to identify heritable molecular pathways and whether they have a positive or negative impact on offspring performance which is a major indicator of overall reproductive success. Characterization of different molecules responsible for non-genetic inheritance will be carried out in females from three strains of rainbow trout as so as their relationship with offspring performance. Firstly, molecular analysis will be performed on eggs, more specifically transcriptome and proteome screening, in order to identify the best females and how (by which mechanisms) they are able to produce high quality descendants. Three levels of gene expression (mRNA, miRNA and proteins) will be evaluated in order to unveil the maternal investment to reproduction. In the second turn, since maternal molecular cargo persists beyond zygotic genome activation, juveniles performance will also be evaluated with regard to growth, survival and disease infection resistance.