Summary data from a Medaka Extended One Generation Reproduction Test (MEOGRT) that assessed the effects of diazinon on growth and reproduction on Japanese medaka. The data includes fecundity, fertility, hatch, time-to-hatch, various measurements of growth, and counts of anal fin papillae for two generations of medaka. This dataset is associated with the following publication: Flynn, K., D. Lothenbach, F. Whiteman, D. Hammermeister, J. Swintek, M. Etterson, and R. Johnson. The effects of continuous diazinon exposure on growth and reproduction in Japanese medaka using a modified Medaka Extended One Generation Reproduction Test (MEOGRT). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY. Elsevier Science Ltd, New York, NY, USA, 162: 438-445, (2018).