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Figure 2


Fig. 2. Optimal model parameters. (A) The optimal EO current density profile (red), called `skewed', is the sum of two Gaussian curves: a narrow (dotted green) sink in the tail region and a wide (dotted blue) source in the mid-body. Rostral curve is centered 15 cm from the tip of the head and has a standard deviation of 4.46 cm; caudal curve is centered 18.04 cm from the tip of the head with a standard deviation of 0.5 cm. The ratio of the peak amplitudes of the two curves is 1:8.38. (B) Optimal conductivity values for the EO (blue), skin (green) and body (red). Optimal parameter values are normalized to one and the errors associated with each optimal parameter value are set to zero. Abscissa values are given as ratios of the optimal parameter value (for each respective curve) and ordinate values are given as field RMS% errors above minimal error (28.6%; see text for details on error measure). Optimal conductivity values are: EO, 0.927 S m-1; body, 0.356 S m-1; skin, 0.0017 S m-1. Although all parameters here were varied homogeneously, it should be noted that the optimal skin conductivity is not uniform along the length of the fish (see Fig. 8A).





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