Target Strength According to Tilt Angle and Length of Black Seabream Acanthopagrus schlegeli at 200 kHz-frequency

摘要

This study determined the acoustic target strength (TS; dB) of black seabream Acanthopagrus schlegeli off the southern coast of Korea. For the ex-situ measurements, 200 kHz split beam transducers were used, and a Kirchhoff-ray mode (KRM) model acoustic model was used for the calculation. The fork length and total weight of the black seabream ranged from 6.4 to 30.8 cm and 6.4 to 683.8 g. respectively 200 kHz , the TS could beexpressed as a function of fork length as: TSmix=201ogI0(FL)-60.35(R=0.92) and TS_(avg)=201og_(10)(FL)-66.89(R=0.88). These TS results for black seabream can be used for estimating the biomass of fish in acoustic surveys in coastal areas.