Noun | 1. | ![]() fish genus - any of various genus of fish Acipenseridae, family Acipenseridae - sturgeons Acipenser transmontanus, Pacific sturgeon, Sacramento sturgeon, white sturgeon - food and game fish of marine and fresh waters of northwestern coast of North America Acipenser huso, beluga, hausen, white sturgeon - valuable source of caviar and isinglass; found in Black and Caspian seas |