Yaron, Z. and Levavi-zermonsky, B. (1986) Fluctuations in gonadotropin and ovarian steroids during the annual cycle and spawning of the common carp. Fish. Physiol. Biochem., pp. 75-86
| Species | Development state | Trait | Primary Data | Secondary Data |
| Cyprinus carpio | Female | Onset of oogenesis | GSI increased gradually from August until February | ['January', 'February', 'August', 'September', 'October', 'November'] |
| Cyprinus carpio | Female | Intensifying oogenesis activity | October to December | ['October', 'November', 'December'] |
| Cyprinus carpio | Female | Maximum GSI value | About 10% | 10.0 percent |
| Cyprinus carpio | Female | Oogenesis duration | 3-4 [August until December] | 3.5 months |
| Cyprinus carpio | Female | Resting period | About two months [June-July] | 3.0 months |
| Cyprinus carpio | Female | Resting period | Almost 0 [July] | 2.0 months |