Panek, F.M. and Weis, J.S., 2012. Age, Growth, and Reproduction of the Eastern Mudminnow (Umbra pygmaea) at the Great Swamp National Wildlife Refuge, New Jersey. Northeastern Naturalist, 19(2), pp.217-228.
| Species | Development state | Trait | Primary Data | Secondary Data |
| Umbra pygmaea | Egg | Oocyte diameter | 1.29-1.62 | 1.46 mm |
| Umbra pygmaea | Egg | Oocyte diameter | 1.00-1.62 | 1.31 mm |