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. Author manuscript; available in PMC: 2009 Jul 25.
Published in final edited form as: Behav Brain Res. 2007 Nov 4;188(1):168–177. doi: 10.1016/j.bbr.2007.10.031

Fig. 8.

Fig. 8

Alarm substance treatment significantly increased freezing in zebrafish. (Panel A) The percent of time zebrafish performed freezing during the observation session is shown. (Panel B) The number of times (frequency) freezing was performed during the observation session is shown. Mean + S.E.M. is shown. Sample sizes (n) represent the number of five-fish shoals tested and are as follows: control (zero alarm substance) with predator present = 10; control (zero alarm substance) with predator absent = 10; high concentration alarm substance with predator present = 10; high concentration alarm substance with predator absent = 10. Note the increase in duration as well as frequency of freezing in response to the alarm substance treatment as compared to control but also note that the presence or absence of the predator had no significant effect. For procedural details, see Section 2. For details of the results of the statistical analysis, see Section 3.