English: A segment of an uninterrupted event, which resulted in cleaning interactions. Recorded by remote video camera 10 March 2009, on Station A, at 08:04 hours, a male pelagic thresher shark ( Alopias pelagicus ) modified its behavior by slowly circling over cleaner territories while lowering its caudal fin in a pose, presumably to facilitate cleaner inspections. This behavioral sequence, which was consistent and repetitive, was categorized as ‘circular-stance-swimming’. Note the fishing line hooked into the shark's right pectoral fin. Many of the elasmobranchs, which visit this site, are similarly affected by human activity.