Behavioral arousal and fright responses ofHalichoeres bivittatus occurred in aquaria to a moving shadow and a ‘tap’ stimulus. Arousal was characterized by changes in the beat of pectoral fins, dorsal fin erection and eye movements, whereas in fright, adduction of pectoral and dorsal fins and rapid forward movement occurred. Serial stimulus presentation caused the fright response to be replaced by arousal which habituated in that the proportion of behavioral components exhibited decreased during the process.
Stimulus Presentation Dick Forward Movement Behavioral Component Serial Stimulus
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