Grant, J.W. and Colgan, P.W., 1983. Reproductive success and mate choice in the johnny darter, Etheostoma nigrum (Pisces: Percidae). Canadian Journal of Zoology, 61(2), pp.437-446.
| Species | Development state | Trait | Primary Data | Secondary Data |
| Etheostoma nigrum | Egg | Incubation time | 7-16 | 11.5 days |