Florida largemouth bass, Micropterus salmoides floridanus (Le Sueur), northern largemouth bass, M.s. salmoides (Lacépède), and their F1 hybrid were stocked in a 3.64-hectare pond, and their growth rates and catchability compared. The hybrid and Florida bass were found to achieve the best growth over a 3-yr period, apparently because of genetic influences rather than environmental factors. Differences in catchability were not observed among the three strains of largemouth bass.