Fig. 1

Fig. 1 Fig. 1. Comparison of behavior between control and zinc chloride-exposed groups in the Mirror biting test. The total swimming distance, average velocity and meander (A); the frequency and total duration of freezing behaviors (B); the frequency and total duration of fast moving behaviors (C); the frequency of entry and total duration in the aversion zone (D); the frequency of entry and total duration in the attack zone (E); the frequency of entry and total duration in the approach zone (F). “*” indicates significant difference between two groups (p < 0.05, n ≥ 22).