Assessment of Target Strength Value of Demersal Fish in Lancang Waters Using Simrad Single Beam Echosounder

Abstract

Hydroacoustic technology is excellent at determining accurately and in near real-time the objects located near the seabed. Therefore, acoustic technology is widely recognized for fisheries resources mapping, including demersal fish. The objective of this study was to estimate the value of demersal fish target strength (TS) in the waters of Lancang Island, Kepulauan Seribu region. A Single Beam Echosounder Simrad EK-15 with a frequency of 200 kHz was employed for data collecting in the waters around Lancang Island. The integration layer width was set at 3 meters with a horizontal integration distance of 200 meters. The average target strength (TSc) values obtained from the integration cell ranged from -55.52 dB to -42 dB with an average of -50.30 dB. Furthermore, the seabed depth influenced the distribution of TSc values, with higher TSc values in deeper habitat locations.