C. elegans containing a knock-out mutation in the nmrk-1 gene do not synthesize an enzyme known as nicotinamide riboside kinase which is involved in the synthesis of NAD+. Preliminary results suggest that a combination of this genetic mutation and an environmental stressor result in a novel delayed hatching phenotype exhibited in eggs laid by nmrk-1 mutants. Our results provide more details about possible factors that may affect the strength of this observed phenotype.