Burke, M.G. and Leatherland, J.F. and Sumpter, J.P. (1984) Seasonal changes in testicular histology of brown bullheads, Ictalurus nebulosus Lesueur. Can. J. Zool., pp. 1185-1194
| Species | Development state | Trait | Primary Data | Secondary Data |
| Ameiurus nebulosus | Male | Maximum GSI value | 0.22 | 0.22 percent |
| Ameiurus nebulosus | Male | Resting period | Resting period is between mid-August to mid-April, i.e. 6 months | 6.0 months |
| Ameiurus nebulosus | Spawning conditions | Spawning season | June to mid-July | ['June', 'July'] |
| Ameiurus nebulosus | Spawning conditions | Spawning temperature | 20 | 20.0 °C |