My research with Rio Grande silvery minnow (Hybognathus amarus), a Federally Endangered species, is conducted in collaboration with Drs. Thomas F. Turner and Megan J. Osborne of the University of New Mexico. This monitoring program has produced a mitochondrial DNA sequence and microsatellite data set that spans 14 consecutive-years, thus far. The primary objective of this long-term study is to determine effects of hatchery augmentation on genetic diversity and effective population size in the wild population. As an extension of this approach, I also am using individual-based simulation (modeling) to help decipher the complex interactions between wild and hatchery-released fish, with emphasis on understanding the relationship between inbreeding and variance effective population size in this species.