Wilkonska, H. and Zuromska, H. (1988) Effects of environment on Coregonus albula (L.) spawners, and influence of their sexual products on the numbers and quality of offspring. Finn. Fish. Res., pp. 81-88
| Species | Development state | Trait | Primary Data | Secondary Data |
| Coregonus albula | Female | Intensifying oogenesis activity | In the vendace of northeastern Poland intense egg growth and yolk accumulation have found to begin in late June-early July, and to last till the spanwing period, i.e. till November | ['June', 'July', 'November'] |