Before the introduction of the triggerfish, the average bout length of locomotor activity was 32.8 ± 7.3 min during the day and 19.2 ± 2 min at night. In the presence of the triggerfish, the average bout length was 14.2 ± 1.4 min during the day and 25.3 ± 3.3 min at night. After the triggerfish was removed, the average bout length during the day was 27.6 ± 0.9 and 8.4 ± 0.7 at night.