High stock density impairs growth, female condition and fecundity, but not quality of early reproductive stages in vendace (Coregonus albula)

•Stock density negatively affected growth, condition and relative fecundity of female vendace.•No effect of stock density on egg size, hatching success and larval size.•Potential larvae production of a lake is primarily driven by spawning stock biomass and relative fecundity.•Additional incorporation of condition of spawners into stock assessment does not improve vendace stock management.