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Fig. 3

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(a) Histograms of sampled raw Sv values from schools (grey bars) and from category “other” (empty bars) for seven echograms associated to fishing hauls with small pelagic fish catches. (b) Histogram of pooled Sv data regardless of category with the Gaussian PDFs fitted by the EM algorithm. The vertical black line at the intersection of the curves represents the optimal −59.4 dB threshold. (c) Posterior probabilities of assigning a given Sv value to each group. The red and green lines in (b) and (c) represent, respectively, the “other” and “schools” categories.

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