Four largemouth bass (Micropterus salmoides) were radio-tracked in Mary Lake duringthe summer of 1970. Maximum home range size ranged from 0.3 to 1.4 hectares and primary orutilized ranges were about 0.4 to 0.35 hectare. Most bass locations were between shore and 3 mdeep and home range shapes tended to be oblong. Bass made excursions of up to 7 days fromtheir primary ranges and returned. A bass was transplanted to Mary Lake from Lake Itasca butdid not establish a home range.