Supplementary video to BEH 3749

While some individuals show a rather consistent exploratory behaviour across both tests (slope close to 0), most test fish either increased or decreased considerably in exploration when being with a conspecific (steep positive or negative slope). These individuals strongly synchronized their swimming behaviour with the conspecific (i.e., remained closely together and, thus, explored very similar parts of the test tank). Despite a synchronized swimming pattern, no further interactions such as aggressive behaviour were observed