Yolk proteins serve nutrition and play physiological function during oocyte hydration and embryo- genesis in teleost. Vitellogenin, which is the precursor substance of yolk proteins, has been widely used as an effective and sensitive biomarker for exposure to environmental estrogens in aquatic environments as well as lipovitellin. Recent progresses of the occurrence of vitellogenin, the organization of lipovitellin and phosvitin, and yolk proteins' physiological function are elaborated. Finally, the developme...