Fucoids have photosynthetic competence in all the stages of ontogenesis. The dynamics of photosynthetic pigment content was investigated in F. vesiculosus tissues from the receptacles with forming gametes till vegetative tissues of adult male and female plants. The Fucus eggs contain 43 % more chlorophyll «a» than antherozoids. During the first 10 days of the development the pigments content in embryos gradually increase up to the concentrations typical for vegetative tissues of adult plants. While aging the share of carotenoids in the sum of pigments gradually decreases from 48 % to 30 %. The pigments content in the vegetative tissues of adult plants is maximal in the basal parts of thalli and minimal in the apices.