Goedmakers, A. and Verboom, B.L. (1974) Studies on the maturation and fecundity of the pike, Esox lucius Linnaeus, 1758. Aquaculture, pp. 3-12
| Species | Development state | Trait | Primary Data | Secondary Data |
| Esox lucius | Female | Absolute fecundity | Range between 20 and 60 000 for female 48 and 60 cm long respectively | 20.0 thousand eggs |
| Esox lucius | Female | Maximum GSI value | Range between 15 and 25% in February | 15.0 percent |