1. Abdalla FC, Cruz-Landim C (2003) Some histological and ultrastructural aspects of oogenesis in Piaractus mesopotamicus Holmerg, 1887 (Teleostei). Braz J Morph Sci 20(1):3–10
2. Aranzábal MCU (2003) The ovary and oogenesis. In: Sever DM (ed) Reproductive biology and phylogeny of urodela, vol 1, 1st edn. Science Publishers, Inc., USA, pp 133–150
3. Browder LW, Erickson CA, Jeffrey WR (1980) Developmental biology, 3rd edn. Sunders College, Fort Worth
4. Dumont JN (1972) Oogenesis in Xenopus laevis (Daudin) I. Stages in laboratory maintained animals. J Morph 136:153–180
5. Fusco S, Filosa S, Motta C (1997) Previtellogenesis in Antarctic fishes: comparison with temperate species. Ital J Zool 64:209–214