Vetemaa, M. and Saat, T. (1996) Effects of salinity on the development of fresh-water and brackish-water ruffe Gymnocephalus cernuus (L.) embryos. Annales Zoologici Fennici., pp. 687-691
| Species | Development state | Trait | Primary Data | Secondary Data |
| Gymnocephalus cernua | Egg | Temperature for incubation | Two incubation temperature at 12 ±0.2°C and 14 ± 2°C | 12.0 °C |