Four species of Rivulus (Neotropical) and four species of Aphyosemion (Etiopical) were observed over 58.1 Hrs in acuaria. Of 37 encounters, 23 were related to sexual behaviour and fourteen to agonistic interactions. A description of the encounters is made. In the sexual encounters, the Aphyosemion male made the female oscillate more frequent intervals but for shorter periods at than Rivulus. The intensity of the aggressive interactions increased with encounter time.
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