siamese fighting fish videos youtubeThe aggressive screen of male Siamese combating fish, Betta splendens hereafter, Bettas, is reliably elicited by images of an alternate male Betta. Visual reinforcement of the responding of these males also has been verified time and again when such images are offered depending on a specified response. In different experiments, visual access to models of different male Bettas Thompson and Sturm, 1965, a live male or female conspecific Rnic, 1977, mirror shows leading to an image of the fish serving as the experimental area Lattal and Metzger, 1994; Thompson, 1963, and film clips of an alternative Betta Turnbough and Lloyd, 1973 all are sufficient to develop and hold operant responding in male Bettas. In addition, the color of the fish supplied as a model Thompson and Sturm, length of mirror presentation Wirth, Lattal, and Hopko, 2003, delay of mirror presentation from the response Lattal and Metzger, and agenda of reinforcement Turnbough and Lloyd each affect the probability of the operant response. Such responding for visual reinforcement also has been reported for other members of the Anabantoid family to which the Betta belongs. In male paradise fish Macropodus opercularis, for instance, mirror images elicit aggressive displays Francis, 1983 and support and maintain operant responses Melvin and Anson, 1970.