Article,

Effect of prior visual experience with a paradise fish (Macropodus opercularis) or a mirror image on strength of aggressive display in Siamese fighting fish (Betta splendens) toward a conspecific, an alien species (Macropodus opercularis), and a mirror image

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Bulletin of the Psychonomic Society, 16 (6): 455--457 (December 1980)

Abstract

Gave 60 adult male Siamese fighting fish 10 days of visual preexposure to either paradise fish or their own mirror images. Separate groups were then allowed to display aggressively toward a conspecific, a paradise fish, or a mirror image. Ss displayed more frequently and for a longer duration when tested with either a conspecific or their own image than with another species. Ss required more time to reach a criterion of no displays when tested with their own mirror image than with another species; this measure did not differ between the conspecific and other species test conditions. It is concluded that strength of aggressive displays in bettas is dependent on previous exposure conditions, the particular stimuli, and the measures used in recording the aggressive response.

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