P N Heinecke

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Adults of three cichlid species, Hemichromis bimaculatus Gill, Cichlasoma nigrofasciatum (Gunther), and Pterophyllum sp., produce sounds of apparent biological significance. Both sexes of H. bimaculatus produce sounds, but whether both sexes in the other species produce sounds has not been established. The most intense tone frequencies in H. bimaculatus and(More)
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