Figure 2.

Change in opercular beat rate of seabass in experimental set 1 during two consecutive short‐term (2 min) exposures to playback of recordings of different sounds (ambient noise, pile‐driving noise or ship noise). In (a) are responses of ‘naïve’ (no prior experience of playbacks) postlarval individuals to ambient‐noise playback followed by playback of one of the three sounds (n = 90 evenly spread between the three treatments). In (b–d) are responses of individuals that have experienced 12 weeks exposure to ambient‐noise playback, pile‐driving‐noise playback or ship‐noise playback, respectively; testing involved a change from playback of the long‐term noise exposure to a different playback track (n = 90 evenly spread between treatments in each case). Shown in all cases are means ± SE, with the significance of pairwise post hoc tests indicated above bars (significant results in bold).