Shortraker (Sebastes borealis), rougheye (S. aleutianus), and northern (S. polyspinis) rockfish are commercially valuable species in the Gulf of Alaska and Bering Sea fisheries. Little is known about their population structure, although it is critical to know the geographical limits of individual production units in order to optimally manage harvests without eroding productivity bases. Segregation of productivity units can produce genetic isolation. Consequently, genetic structure can provide information about the geographic/oceanographic (upper) limits of productivity units of a species. This project conducted preliminary surveys of mitochondrial and microsatellite DNA variation in geographically distinct samples of these species. The preliminary analyses detected indications of population structure in rougheye and shortraker rockfish but not in northern rockfish. However, failure to detect structure should not be interpreted as absence of structure. For the second phase of this project, the investigators planned to increase the numbers of samples and collections examined.