Figure 2. Effect of Object Location and Conductivity on Spatial Electroacuity.

In all panels, see fish insets for approximate lateral and rostro–caudal locations where S_min was calculated. Error bars represent the sampling that was used to calculate the S_min (either 0.5 or 1 mm). Lateral distance is measured as object center to fish skin (as in Figure 1).

(A) Effect of lateral distance on S_min for three distinct object diameters (rostro–caudal location, x = 0.11 m). Red, 0.3 cm (prey size); green, 1 cm; blue, 2 cm. Object conductivity fixed at 0.0303 S/m (prey conductivity).

(B) Effect of rostro–caudal position on S_min for same object sizes and conductivity as (A), with a lateral distance of 0.012 m.

(C) Effect of lateral distance on S_min for three distinct object conductivities (rostro–caudal location, x = 0.11m). Red, 0.0005 S/m (plant conductivity); green, 0.0303 S/m (prey conductivity); blue, 0.5 S/m. Object diameters fixed at 0.3 cm (prey size).

(D) Effect of rostro–caudal position on S_min for same object diameter and conductivities as in (C), with a lateral distance of 0.012 m.