The OIG investigated allegations that a former U.S. Fish and Wildlife Service (FWS) assistant hatchery manager directed an FWS biologist to validate an inaccurate cause of death for an endangered fish species in a mortality report to cover up alleged neglect at an FWS fishery. It was also alleged that a culture of censorship existed within that FWS region’s management. We investigated this matter jointly with the U.S. Department of the Interior’s (DOI’s) scientific integrity coordinators, Office of Quality and Science Integrity, U.S.