Banks, S.D. and Thomas, P. and Baer, K.N. (1999) Seasonal variations in hepatic and ovarian zinc concentrations during the annual reproductive cycle in female channel catfish (Ictalurus punctatus). Comparative Biochemistry and Physiology, C [Comp. Biochem. Physiol., C], pp. 65-72
| Species | Development state | Trait | Primary Data | Secondary Data |
| Ictalurus punctatus | Female | Onset of oogenesis | A slight increase from November until March | ['January', 'February', 'March', 'November'] |
| Ictalurus punctatus | Female | Intensifying oogenesis activity | A siginificant increase (148%) in April | ['April'] |
| Ictalurus punctatus | Female | Maximum GSI value | 15.2 [June] | 15.2 percent |
| Ictalurus punctatus | Female | Resting period | About 4 [From July until November] | 4.0 months |