Mackenzie and Thomas and Farrar. (1989) Seasonal changes in thyroid and reproductive steroid hormones in female channel catfish (Ictalurus punctatus) in pond culture. Aquaculture, pp. 63-80
| Species | Development state | Trait | Primary Data | Secondary Data |
| Ictalurus punctatus | Female | Onset of oogenesis | GSI Increase sugnificantly from September to October and November to January | ['January', 'September', 'October', 'November'] |
| Ictalurus punctatus | Female | Intensifying oogenesis activity | April | ['April'] |
| Ictalurus punctatus | Female | Maximum GSI value | 10.9 [June, July] | 10.9 percent |
| Ictalurus punctatus | Female | Resting period | About 2 [GSI was low during the summer months: July and August] | 2.0 months |
| Ictalurus punctatus | Spawning conditions | Spawning season | June and July but most spawning activity apperaed to have ended by June | ['June', 'July'] |