Acoustics plays an important role in the study of monitoring underwater marine species. Most of the marine activities involve emissions of underwater sound. Underwater acoustics is an approach to judge the human impact on marine species also to get a knowledge on their population, behavior, migration patterns, identify critical habitat, and study bioacoustics. Passive acoustics monitoring (PAM) methods enable nonstop and remote sensing in a cost- and time-effective manner. PAM techniques offer inherent significance both independently and as a supplementary approach to visual observation and tagging when researching marine species. This research focuses on study of PAM of Black Tilapia, one of the underwater species, which highly efficiently off soars around the coastal region of Chennai. This study analyzes the acoustics of the mentioned species using single-element hydrophone with a frequency range (100 Hz–4 kHz). The PSD plot of the species’ hydrophone data and the work focuses on the vocalization behavior of the collected data of Black Tilapia species which are analyzed in detail.