The influence of parental and genotype effects on early survival and development in Atlantic salmon

<jats:p> Parental qualities can influence the development and fitness of their offspring via genetic and non-genetic effects. Although these effects are often linked to parental phenotypes, the effect of parental genetic variation linked with relevant phenotypes is less well understood. We performed full factorial crosses based on parental genotypes for an age-at-maturity-related gene, <jats:italic>vgll3</jats:italic> , to investigate how the parental genotypes influence Atlantic salmon ( <jats:italic>Salmo salar</jats:italic> ) offspring survival, growth, and development in their early life. Beyond the connection with age at maturity, the additional association between <jats:italic>vgll3</jats:italic> and body condition in Atlantic salmon offers a potential pathway by which the maternal <jats:italic>vgll3</jats:italic> genotype could influence offspring early life fitness. Combined with measurements of maternal phenotype and egg characteristics, the crossing design therefore allowed us to disentangle the maternal and paternal genetic and non-genetic contributions to variation in offspring survival and phenotypic traits. The phenotypic traits measured were hatching length and yolk sac area, growth, and yolk sac consumption and conversion efficiency. Parental <jats:italic>vgll3</jats:italic> genotype did not influence the majority of our measured egg traits or alevin traits except for a genetic effect of paternal <jats:italic>vgll3</jats:italic> genotype on offspring survival, whereby the paternal late maturation allele was associated with higher survival. Maternal effects were strongest for survival and for traits associated with hatching and weaker for alevin growth and yolk sac usage. Paternal effects on the measured alevin traits were negligible. The results from our study demonstrate that both maternal and paternal effects have the potential to influence offspring early life fitness traits. </jats:p>