The white seabass (Atractoscion nobilis) is an important transboundary fishery resource exploited by the U.S. and Mexico. White seabass commercial landing estimates for the past 100 years have formed the basis of U.S. management regulations. However, species-specific landing records for white seabass are unavailable for Mexico and management efforts based on fishery trends are not possible. To better document the Mexican harvest of white seabass and the factors contributing to annual landing trends in the commercial fishery, we used a six-step process to reconstruct white seabass harvest along the west coast of the Baja California Peninsula from 1949 to 2019. Although historical records obtained from Mexican Fisheries Statistics Year Books and those from Official Catch Landings Reports do not directly align. Both data sources show that overall Mexican white seabass landings has increased over the last 30 years with disparate regional trends. The increase is largely from the small-scale gillnet fleet of Baja California Sur, which accounts for more than 97% of the total catch. Based on the Official Catch Landings Reports, estimated landings show a large increase (228%) over the past 20 years. The landings reconstruction estimates provide baseline information that can be used to better manage and monitor the white seabass in Mexico. Further, given the transboundary nature of the resource, these data may help establish the information needed to explore co-management efforts with the U.S. This work highlights the value of the white seabass to the fisheries off Baja California and supports the need for the continued collection of new and accurate information on catch levels, fishing effort, and stock structure of this transboundary resource.