 Foam nests, made up of air bubbles glued together with mucus from the mouth, are also well known in gouramis and armoured catfish.Fish can remember the attributes of other individuals, such as their competitive ability or past behavior, and modify their own behavior accordingly.For example, they can remember the identity of individuals to whom they have lost in a fight, and avoid these individuals in the future; or they can recognize territorial neighbors and show less aggression towards them as compared to strangers.