Acoustic behavior of snapping shrimp in east china sea

Abstract

Ambient noise in shallow water is typically more complicated than that in deep sea. The snapping shrimp, which is a major source of ambient noise in shallow water, produces impulsive-shape noise. During the period of 14–28 May 2015, the Shallow-water Acoustic Variability Experiment (SAVEX15) was performed in the East China Sea (ECS) at a shallow water off the southwest of Jeju Island, Korea. In the study area, snapping shrimp noise was recorded continuously with dominant frequencies higher than 3 kHz. Envelope correlation method combined with the threshold detection was used to extract the snapping events from the received ambient noise data. Although many previous research studies have reported that the diurnal variation of snapping shrimp noise is mainly due to water temperature variation controlled by light availability, the observed snap rates in our experimental site showed unusual sinusoidal pattern and seemed to be positively correlated with the phase of the tidal current. [Work supported by the Development of Civil Military Technology Program (No. 18-SN-RB-01) from the Institute of Civil Military Technology Cooperation (ICMTC) of the Republic of Korea.]