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Spots of various size are common for fish patterning, e.g. juvenile of Synodontis multipunctatus, that has spots of increasing size from tail to head (a). We have reproduced this pattern using model (3) with corresponding function w0(x) (b). The resulting pattern formed by u is given in (c) for t = 8000. Model parameters are: k1 = 0.97, k−1 = 0.1, ρ = 0.6, μu = 0.03, μv = 0.08, D = 0.1.
