Figure 2

Correlations between auditory thresholds and fish size at frequencies tested. Semilog plots of hearing thresholds of each individual against log of standard-length at each frequency tested. N = 39 at each frequency except 6000 Hz (N = 34). Pearson's correlation coefficients and significances are given in graphs. Regression equations: x = log standard length, y = hearing threshold (dB re 1 μPa); 50 Hz: y = -1.92x + 117.79; 100 Hz: y = -21,33x + 125.27; 300 Hz: y = -29.91x + 130.33; 500 Hz: y = -21.32x + 111.67; 800 Hz: y = -22.84x + 114.81; 1000 Hz: y = -21.44x + 112.46; 2000 Hz: y = -11.57x + 95.77; 3000 Hz: y = -1.57x + 81.83; 4000 Hz: y = 5.34x + 74.30; 5000 Hz: y = 15.83x + 60.13; 6000 Hz: y = 19.68x + 54.78.