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(a) The relationship between Charge Rate and Activity. (b) Zebrafish groups with recent experience in a more-complex environment (black bars) were not consistently more active than were those with recent experience in a less-complex environment (gray bars). Instead, fish groups tested in a novel PVC context (two bars on the right) were less active than were fish groups tested in a novel empty arena (two bars on the left) (F1,51 = 6.0, P < 0.02). Error bars represent ± 1 standard error.
