Zholdasova, I.M. and Guseva, L.N. (1987) Oogenesis and cyclic changes in the gonads of male and female catfish, Silurus glanis , in the lower Amudar'ya basin. Journal of Ichthyology, pp. 1-8
| Species | Development state | Trait | Primary Data | Secondary Data |
| Silurus glanis | Egg | Oocyte diameter | 1.65-2.3 [Diameter of ovulated egg cells] | 1.97 mm |
| Silurus glanis | Egg | Egg adhesiveness | Adhesive [This adhesive membrane ensures the development of the released eggs attached to substrate] | Adhesive |
| Silurus glanis | Female | Age at sexual maturity | 4 [Mass maturation in 5-6 years] | 5.5 year |
| Silurus glanis | Female | Length at sexual maturity | 63.5 | 63.5 cm |
| Silurus glanis | Female | Weight at sexual maturity | 2.6 | 2.6 kg |
| Silurus glanis | Female | Oocyte development | Asynchronous development of sex cells | Asynchronous |
| Silurus glanis | Female | Onset of oogenesis | Yolk accumulation in the oocytes of the old generation begins in autumn, and continues for 7-8 months | ['October', 'November', 'December'] |
| Silurus glanis | Female | Maximum GSI value | 7.5% [Maturation coefficient, measured prior to spawning] | 7.5 percent |
| Silurus glanis | Female | Oogenesis duration | 7-8 months | 7.5 months |
| Silurus glanis | Female | Resting period | July, August: 0.42-0.81% | 3.0 months |
| Silurus glanis | Male | Age at sexual maturity | 3 [Mass maturation at 4-5] | 4.5 years |
| Silurus glanis | Male | Length at sexual maturity | 70.5 | 70.5 cm |
| Silurus glanis | Male | Weight at sexual maturity | 2.2 | 2.2 kg |
| Silurus glanis | Male | Onset of spermatogenesis | End of July-August | ['July', 'August'] |
| Silurus glanis | Male | Main spermatogenesis activity | September | ['September'] |
| Silurus glanis | Male | Maximum GSI value | May reach 0.94%, but mean is 0.38% | 0.94 percent |
| Silurus glanis | Male | Spermatogenesis duration | 2 months [July to September] | 2.0 months |
| Silurus glanis | Male | Resting period | 0.12-0.25% at the end of July [June-July] | 3.0 months |
| Silurus glanis | Spawning conditions | Spawning season | Second half of May | ['May'] |
| Silurus glanis | Spawning conditions | Spawning period duration | 3-4 [Begins at the end of June and ends in Mid-July] | 3.5 weeks |
| Silurus glanis | Spawning conditions | Spawning temperature | 18-19°C | 18.5 °C |
| Silurus glanis | Spawning conditions | Spawning water type | Spawn in Amudar'ya River, its backwaters and lakes adjacent to the river | Stagnant water |
| Silurus glanis | Spawning conditions | Spawning release | Spawns intermittently [Most female spawns two batches of eggs] | Multiple |
| Silurus glanis | Spawning conditions | Parity | Alternate year spawning by some females | No category |