Study of sound made by marine species aid in ambient noise studies and its characterization. Open sea measurements were conducted off Erwadi (near Ramanathapuram, Tamil Nadu) to study biological noise. The sound of shallow water lobsters (Panulirus Homarus) has been studied in detail using the noise measurements made in open ocean environment and the results was compared with measurements taken in a controlled environment in laboratory. It has been shown that the lobsters produce sound like musical instruments having their own fundamental harmonic frequency components.