Study on bioacoustic learns about sound production, dispersion through elastic media, and reception in animals, including humans, intensity of sound amplitude, sound fluctuation, and sound patterns of fish. Bioacoustic is a multidiscipline science that combine biology and acoustic science that usually refer to sound production research, sound dispersion through the elastic medium, and sound reception in animal including guppy fish (Poecilia reticulata). In this research, salt level about 2 g/mol was added in the water/medium until the salinity was 30 ppm. The result indicated that the sound intensity of guppy fish on days 3 and 7 after the addition of salt reaches the highest value of -44 dB with interval time of 40-50 seconds. This research showed that guppy fish can survive in salinity 30 ppm with sound intensity -48 dB and the frequency of flapping fins or guppy fish stridulatory was 0-19.60 kHz.
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