Crivelli, A.J. and Rosecchi, E. (2001) La grémille Gymnocephalus cernuus (Linné, 1758)., pp. 306-307
| Species | Development state | Trait | Primary Data | Secondary Data |
| Gymnocephalus cernuus | Spawning conditions | Spawning substrate | Plants, or gravel | Ambiguous |
| Gymnocephalus cernuus | Spawning conditions | Spawning temperature | 12-18 | 15.0 °C |
| Gymnocephalus cernuus | Female | Relative fecundity | 305-1540 | 922.5 thousand eggs/kg |
| Gymnocephalus cernuus | Female | Age at sexual maturity | 1-3 [Sex not specified] | 2.0 years |
| Gymnocephalus cernuus | Egg | Oocyte diameter | 0.9-1.2 | 1.05 mm |
| Gymnocephalus cernuus | Spawning conditions | Spawning season | March to August | ['August', 'March'] |
| Gymnocephalus cernuus | Female | Age at sexual maturity | 1-3 [Sex not specified] | 2.0 year |
| Gymnocephalus cernuus | Spawning conditions | Spawning release | Female spawn several batches during the spawning season | Mutliple |