Table 4. Measurement of sound tone and frequency on the up and down condition of the attractor (Fig. 3B)

Observation (Fig. 3B.1)	Observation (Fig. 3B.2)	Observation (Fig. 3B.3)
• Attractor lowering to the water (fish were detected approaching the attractor in large numbers).	• Attractor raising from the water (fish were detected to disappear /away from the attractor).	• Attractor lowering again (fish were detected approaching the attractor in large numbers).