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Rountree conducted extensive underwater sound recording in the Peruvian Amazon, specifically focusing on piranhas. Using a hydrophone, he captured unique vocalizations from 129 piranhas across four species, noting that he could differentiate between species by analyzing characteristics such as pitch, harmonics, and the sound's quality. He describes the piranha sound as a 'bark' or 'honk,' produced by manipulating their swim bladder. Beyond piranhas, Rountree also recorded dozens of other river species, including catfish. His research extended to recording 10 hours of underwater soundscapes, such as one captured during a piranha feeding frenzy, which revealed a cacophony of piranha honks and catfish screeching. The implications of this work suggest that detailed underwater soundscape analysis could offer significant insights into the behavior and interactions of aquatic life in unclear water environments. 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