Kestemont, P. and Rinchard, J. and Feys, V. and Fostier, A. (1999) Spawning migrations, sexual maturity and sex steroid levels in female roach Rutilus rutilus from the River Meuse. Aquatic Sciences [Aquat. Sci.], pp. 111-121
| Species | Development state | Trait | Primary Data | Secondary Data |
| Rutilus rutilus | Spawning conditions | Spawning migration period | The first migrations of roach to the backwaters started in mid-January and peaked from early February until late April. In mid-May, the daily migrations into the backwaters decreased considerably whereas no fish were caught after then end of June. | ['January', 'February', 'April', 'May', 'June'] |