Sulistyo, I. and Rinchard, J. and Fontaine, P. and Gardeur, J.N. and Capdeville, B. and Kestemont, P. (1998) Reproductive cycle and plasma levels of sex steroids in female Eurasian perch Perca fluviatilis. Aquat. Living. Resour., pp. 101-110
| Species | Development state | Trait | Primary Data | Secondary Data |
| Perca fluviatilis | Female | Onset of oogenesis | August-September, then increase gradually until mid-March | ['March', 'August', 'September'] |
| Perca fluviatilis | Female | Intensifying oogenesis activity | Beginning of spring, GSI rapidly reached its maximum | ['April', 'May', 'June'] |
| Perca fluviatilis | Female | Maximum GSI value | 25 % [April prior to spawning] | 25.0 percent |
| Perca fluviatilis | Female | Oogenesis duration | From august to April : 7-8 months | 7.5 months |
| Perca fluviatilis | Female | Resting period | 3-4 | 3.5 months |
| Perca fluviatilis | Female | Resting period | <1% [End of spring and summer corresponds to the post-spawning period] | 1.0 months |