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Mating, parental, and aggressive behavior were qualitatively and quantitatively studied in domestic and wild paradise fish. No qualitative behavioral differences were observed. Domestic paradise fish exhibited significantly longer intervals between consecutive spawnings, produced more eggs per mating, and had more incomplete spawning acts between spawnings. Domestic males exhibited more intense and longer lasting parental care. They also built larger bubble nests and maintained these nests for a longer period after mating. Wild fish were more aggressive than domestic fish. Male-male encounters of wild fish exhibited significantly shorter latencies prior to attack and jaw lock and more threats and attacks during the 10 min test period. It is concluded that domestic animals have been subjected to inbreeding which has resulted in significant quantitative changes in mating, parental, and aggressive behavior.