Juvenile largemouth bass (Micropterus salmoides) and smallmouth bass (
M. dolomieu) were videotaped in aquaria and in a river, and were obser
ved exhibiting 18 types of agonistic behavior. Behavioral patterns inc
luded attempts to injure, threatening displays, and appeasement postur
es. Field observations confirmed that juvenile smallmouth bass can dis
play complex agonistic behavior within 50 days of hatching.