Heese, T. (1990) Gonad development and fecundity of whitefish, Coregonus lavaretus (L. 1758) from the Pomeranian Bay. Acta Ichthyologica et Piscatoria [ACTA ICHTHYOL. PISC.], pp. 3-12
| Species | Development state | Trait | Primary Data | Secondary Data |
| Coregonus lavaretus | Female | Age at sexual maturity | Fermales were mostly aged 2+; less numerous were age groups 3+ and 4+. The youngest and oldest females were aged 1+ and 10+ | 2.0 year |
| Coregonus lavaretus | Female | Relative fecundity | Mean 45721.2, range 29012-63468 [Other studies: 20000-45000] | 46240.0 thousand eggs/kg |
| Coregonus lavaretus | Female | Absolute fecundity | Mean of 64945.6, range 23650-131418, for female of 39.5-59.2 cm | 77534.0 thousand eggs |
| Coregonus lavaretus | Female | Onset of oogenesis | July (?) | ['July'] |
| Coregonus lavaretus | Female | Intensifying oogenesis activity | September-October | ['September', 'October'] |
| Coregonus lavaretus | Female | Maximum GSI value | Up to 29-30% [End of November] | 29.5 percent |
| Coregonus lavaretus | Female | Resting period | After spawning, the gonads were basically resting until April and May | 3.0 months |
| Coregonus lavaretus | Male | Onset of spermatogenesis | June | ['June'] |
| Coregonus lavaretus | Male | Main spermatogenesis activity | September-October | ['September', 'October'] |
| Coregonus lavaretus | Male | Maximum GSI value | Mean of 3% [In the end of October] | 3.0 percent |
| Coregonus lavaretus | Male | Resting period | Below 1%, between February and May | 1.0 months |
| Coregonus lavaretus | Spawning conditions | Spawning season | Late November-early December | ['November', 'December'] |
| Coregonus lavaretus | Spawning conditions | Parity | The youngest and oldest females were aged 1+ and 10+ | No category |