Kovac, V., Copp, G.H. and Sousa, R.P., 2009. Life-history traits of invasive bighead goby Neogobius kessleri (Gunther, 1861) from the middle Danube River, with a reflection on which goby species may win the competition. Journal of Applied Ichthyology, 25(1), p.33.
| Species | Development state | Trait | Primary Data | Secondary Data |
| Ponticola kessleri | Egg | Egg size after water-hardening | 0.04-1.70 mm | 0.87 mm |