Nitrogenous and carbonaceous waste associated with decaying eggs, eggshell debris, and hatching-related fluids, can overload egg incubation systems. In this work, BOD5, nitrogen, and protein are measured and compared across decaying eggs of 8 species to determine similarity in loading behavior. A statistical analysis shows that marine and freshwater species display similar dead egg loading. Results suggest that a unified sizing criteria developed for application across many species would suffice for incubation biofiltration sizing. A conservative loading of 120 mgNd-1g-1 is estimated for the egg masses of species investigated, assuming a 100% loss and decay over a 24-hour period. Biofilter sizing criteria of 0.8 and 1.6 L g-1 for floating bed filter and moving bed filter, using typical media, are recommended.