This video was taped in March 2013,
At Kek Lok Si temple, Air Itam, Penang, Malaysia.
I captured something I have never seen on how the koi fish swim in a circular motion, for more than 20 minutes. I still have not find out the reason why the Koi swim in such way? Based on my observation, there is a leader among the Kois which decide which direction all must swim, then the rest just follow.