STRIPPED BONITO BIOMASS ESTIMATION USING BLUEROBOTICS SONAR IN BALI STRAIT AREA
I Gede Merta Yoga Pratama (a*), Mutiara Rachmat Putri (a), Agus Setiawan (b)

a) Faculty of Earth Sciences and Technology, Bandung Institute of Technology
Jl. Ganesa No.10, Bandung 40132, Indonesia
*mypratama96[at]gmail.com

b) Indonesian National Research and Innovation Agency, Jakarta, Indonesia

Abstract

Stripped bonito (locally known as Kenyar) has a high economic value to the fishermen community around Bali Strait area. However, those traditional fishermen struggle to estimate the biomass of Kenyar below sea levels. This research aims to estimate the biomass of Kenyar using hydroacoustic method in Bali Strait area. The acoustic data was collected through 3 fishing trips in Badung Regency, using the BlueRobotics Ping Sonar Altimeter and Echosounder. The analysis results of Target Strength (TS), and the estimation of fish length, weight, and density were being validated by comparing the calculation result of the acoustic data to the 60 samples of fish measured after being caught. This research resulted that the Target Strength (TS) value is in the range of -38.5 dB to -34.5 dB, with the estimated fish length (L) of 30.4 - 52 cm, and the estimated fish weight of 1,500 - 2,500 grams. There were 223 fishes detected by the sensor with the average density of 3 ind/1000m3. The total biomass of Kenyar estimated from those 3 fishing trips is 510 kgs.

Keywords: Biomass estimation, Stripped bonito, Aqoustic, Bali Strait, Target strength

Topic: Ocean Remote Sensing and Marine Technology