FIGURE 2 in Chub movement is attracted by the collision sounds associated with spawning activities

FIGURE 2. Sound profiles and field experiments. Waveform (rel. amplitude [kUnit] = proportional to the sound pressure of the recording), spectrogram (frequency [kHz]) and power spectral density (PSD, [dB]) of (a) the 3-minutes collision sound, (b) ambient noise and (c) music noise. The right two diagrams highlight the three sounds that fish may sense, including the frequency lower than 8 kHz. (d) Fixed playing order of sound profiles as example for each time of experiment, 5 minutes of music noise; 6 minutes of ambient noise; 3 minutes of collision sound (mating). The bar regions represent 3 minutes of sound for further statistics. Two field experiments with underwater sound player on a putative redd and home-make jerkbaits (e) based on the mature chub's coloration-- (f) Beker without chub-like jerkbaits; (g) Beker with chub-like jerkbaits.