Exposed 60 male Betta to ripe-female-conditioned water (RFCW) from either goldfish or 1 of 4 Belontiidae species: (a) Betta splendens, (b) Colisa labiosa, (c) Colisa lalia, (d) Macropodus opercularis, or (e) Trichogaster trichopterus. Time spent near and within a stimulus source tube was used to measure chemosignal activity. Both behavioral measures showed evidence for interspecific chemocommunication. The proximity measure indicated a phylogenetically nonspecific chemosignal, whereas tube occupancy indicated the presence of a specific Belontiidae system. In a stimulus generalization test with a psychophysical paradigm, 4 male Betta were trained to discriminate Betta RFCW from goldfish RFCW and were subsequently presented with RFCW from either (a) C. lalia, (b) M. opercularis, (c) T. trichopterus, and (d) P. reticulata. The latter contained novel stimulus generalization chemosignals. Male Betta perceived Belontiidae RFCW stimuli as similar, whereas guppy RFCW was perceived neither as Belontiidae as nor goldfish RFCW. (13 ref) (PsycINFO Database Record (c) 2004 APA, all rights reserved)