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Fig. 4


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Examples of echograms associated to fishing hauls with small pelagic fish catches. (a) and (b) are, respectively, the thresholded versions of the raw echogram in Figure 1a using −60.4 (from Fig. 2f) and the optimal −59.4 dB estimated from the raw Sv samples. (d) and (f) are the thresholded versions of (c) and (e) using a −59.4 dB threshold. The colour scale is the same for all echograms.

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