Chapter 1_Vitellogenin: Outline and History -- Chapter 2_Previtellogenesis and Vitellogenesis -- Chapter 3_Diversification and classification of Vitellogenin in fishes -- Chapter 4_State-of-art of multiple vitellogenin systems in fishes -- Chapter 5_Tools for identification and characterization of Vitellogenin -- Chapter 6_Functional aspects of Vitellogenin in oogenesis and its regulatory mechanism -- Chapter 7_Role of Vitellogenin as immunocompetent molecule -- Chapter 8_Vitellogenesis and Reproductive Strategies -- Chapter 9_Vitellogenin: as a hormone -- Chapter 10_Vitellogenin as a biomarker -- Chapter 11_Fish vitellogenin induction and its related egg yolk proteins -- Chapter 12_Vitellogenin receptors in fishes -- Chapter 13_Molecular cloning and induction of vitellogenins -- Chapter 14_Significance of Vitellogenin in egg yolk production and egg quality -- Chapter 15_Concentration of Vitellogenin and disruption of the endocrine system in Fish -- Chapter 16_Biological activities of Vitellogenin and its mechanism -- Chapter 17_Multivalent properties of Vitellogenin in marine and freshwater fishes. -Chapter 18_Effect of Vitellogenin in growth of ornamental fishes -- Chapter 19_Future prospective of Vitellogenin research. .