Bezdenezhinykh, V.A. and Petukhov, V.B. (1982) Oogenesis of the common eel, Anguilla anguilla . Journal of Ichthyology, pp. 100-105
| Species | Development state | Trait | Primary Data | Secondary Data |
| Anguilla anguilla | Female | Onset of oogenesis | Only after the fish begin their migration does further growth and development of gonads and oocytes take place , GSI at about 1.0-1.6 | No data |
| Anguilla anguilla | Female | Maximum GSI value | Reach 43.8-57.9 before spawning | 50.85 percent |